What Food Processing Cleaning Chemicals Are Used on Equipment?
Food plants use detergents to remove soil and sanitizers to reduce bacteria on surfaces that have already been cleaned. Common food processing cleaning chemicals include alkaline, chlorinated alkaline, acid, neutral, and enzyme detergents. Common sanitizer chemistries include chlorine, quaternary ammonium compounds, peracetic acid, iodine, and chlorine dioxide.
The right choice depends on what is stuck to the equipment, what the equipment is made from, how it is cleaned, and what the product label requires.
A stronger chemical is not automatically a better chemical. The best program removes the target soil without damaging equipment, leaving unwanted residue, exposing workers to avoidable risk, or creating problems during the next production run.
Key Points
Detergents remove fats, proteins, starches, sugars, minerals, and other soils.
Sanitizers work after cleaning; they should not be expected to cut through visible residue.
Alkaline chemistry generally fits organic food soils, while acid chemistry generally fits mineral deposits.
Concentration, temperature, contact time, water quality, and mechanical action all affect the result.
Food-contact use, rinsing, draining, and wet-contact requirements come from the exact product label, not from a general rule.
Why does chemical selection matter in a food plant?
Chemical selection affects more than how stainless steel looks after cleanup. It can affect allergen control, microbial control, pre-operational findings, employee exposure, equipment condition, wastewater, sanitation time, and production startup.
The CDC’s food-safety statistics page, updated in November 2025, estimates that foodborne illness causes 48 million illnesses, 128,000 hospitalizations, and 3,000 deaths in the United States each year. A separate CDC analysis published in March 2025 estimated that seven major pathogens caused 9.9 million domestically acquired foodborne illnesses, 53,300 hospitalizations, and 931 deaths.
Those figures do not mean sanitation chemicals alone can prevent every foodborne illness. Contamination can enter at many points in the supply chain. They do show why a plant cannot treat equipment cleaning as a cosmetic task.
Under current 21 CFR 117.35, food-contact surfaces must be cleaned as often as necessary to protect against contamination and allergen cross-contact. Cleaning compounds and sanitizers must also be safe and adequate under their conditions of use.
What is the difference between a cleaner and a sanitizer?
A cleaner removes soil. A sanitizer reduces bacteria on a surface after the soil has been removed.
The distinction matters because food residue can block a sanitizer from reaching the surface. Grease, protein, starch, and mineral film can also react with or consume active chemistry.
The EPA’s current explanation of cleaning and sanitizing, updated in October 2025, states that cleaning removes dirt and organic matter with soap or detergent. Sanitizing uses chemicals to kill bacteria on surfaces. EPA registers products that make sanitizing or disinfecting claims.
A normal wet-sanitation sequence may include:
Removing loose product and packaging
Pre-rinsing where the procedure calls for water
Applying a detergent
Providing the required time, temperature, and physical action
Rinsing the detergent and released soil
Inspecting the surface
Applying the labeled sanitizer
Allowing the required contact time, draining, and drying
Completing pre-operational verification
The exact sequence can change for dry-processing areas, sensitive equipment, allergen changeovers, membrane systems, or equipment that must be disassembled.
Which detergents are used to clean food processing equipment?
Most food-plant detergents fall into five broad groups. Each group addresses a different soil or operating need.
Detergent type Common target Typical plant applications Main points to check
Alkaline detergent Fat, oil, grease, protein, cooked food residue Tanks, piping, fryers, fillers, conveyors, mixers Surface compatibility, temperature, concentration, rinsing
Chlorinated alkaline detergent Heavy organic soil, protein film, difficult residues Open-plant foam cleaning, selected CIP or COP programs Chlorine compatibility, corrosion risk, ventilation, chemical separation
Acid detergent Mineral scale, milkstone, water deposits, oxidation film Dairy equipment, beverage lines, heat exchangers, CIP circuits Metal compatibility, acid-resistant seals, rinse quality
Neutral or mild detergent Light oils, loose soil, sensitive surfaces Manual cleaning, tools, lightly soiled components May not remove baked-on protein, heavy grease, or scale
Enzyme detergent Protein, fat, starch, or mixed organic residue Small parts, membranes, sensitive systems, targeted cleaning Enzyme type, temperature range, contact time, storage
Alkaline detergents
Alkaline detergents are the main choice for many organic food soils. Depending on the formulation, they may contain sodium hydroxide, potassium hydroxide, carbonates, silicates, surfactants, water conditioners, and corrosion-control ingredients.
They are commonly used against:
Animal and vegetable fats
Oils and grease
Protein deposits
Cooked sauces
Dairy residue
Carbonized or dried organic material
Mixed production soil
The correct alkalinity depends on the soil and surface. A heavy caustic product may fit a stainless steel CIP circuit but be a poor choice for aluminum, painted surfaces, certain elastomers, or manual cleaning.
High alkalinity can also make worker protection, dispensing control, rinsing, and storage more demanding.
Chlorinated alkaline detergents
Chlorinated alkaline detergents combine alkaline cleaning ingredients with a chlorine source. They are often considered when a plant has stubborn organic residue, protein film, discoloration, or difficult open-plant soils.
They should not be confused with a final sanitizer. A chlorinated detergent is still primarily part of the cleaning step unless its EPA label states an approved antimicrobial use.
Chlorinated products require strict chemical separation. Never mix a chlorine product with an acid, ammonia, or another incompatible cleaner. The combination can release hazardous gas.
Acid detergents
Acid detergents are used mainly for inorganic deposits, including:
Hard-water scale
Calcium deposits
Milkstone
Mineral film
Beerstone
Rust staining
Alkaline chemical residue
Common formulations may contain phosphoric, nitric, sulfamic, citric, or other acids.
An acid wash should not be added simply because equipment looks dull. First confirm that the problem is mineral buildup rather than protein, fat, damaged metal, or poor rinsing.
Acid concentration, temperature, circulation time, and frequency should match the soil load and equipment design. Seals, welds, soft metals, concrete, grout, and nearby surfaces also need review.
Neutral and mild detergents
Neutral or mildly alkaline detergents are often used where the soil is light or the surface cannot tolerate aggressive chemistry.
They may fit:
Removable tools
Manual cleaning stations
Light-duty equipment
Painted surfaces
Some plastics and elastomers
Sensitive electronic housings when the manufacturer allows wet cleaning
A mild cleaner may reduce surface risk, but it will not necessarily remove cooked-on fat, dried protein, or mineral scale. Chemical selection still starts with the soil.
Enzyme detergents
Enzyme detergents use specific enzymes to break down certain food residues:
Protease acts on protein
Lipase acts on fats
Amylase acts on starch
Other enzyme systems may target carbohydrates or mixed soil
These products can help with sensitive surfaces, membranes, small components, or residues that are difficult to remove with standard chemistry.
Enzyme performance depends on temperature, pH, contact time, and storage. Excessive heat or an incompatible pH may reduce enzyme activity.
What ingredients help detergents work?
The active alkali or acid is only one part of a detergent formulation. Other ingredients affect wetting, soil suspension, water hardness, foam, rinsing, and equipment protection.
Surfactants
Surfactants help the cleaning solution spread across the surface and penetrate oily soil. They can also keep released soil suspended so it is carried away during rinsing.
Chelating and sequestering agents
These ingredients bind minerals in hard water and may reduce deposits that interfere with cleaning. They can be important in CIP systems, bottle washing, dairy operations, and facilities with high mineral content in the water supply.
Builders
Builders support alkalinity, water conditioning, and soil removal. Their role depends on the full formulation rather than one ingredient alone.
Oxidizing ingredients
Chlorine and other oxidizing agents may help break down or alter difficult organic residues. They can also create material-compatibility and worker-exposure concerns.
Corrosion inhibitors
Some detergents contain ingredients intended to reduce attack on specific metals. Their presence does not mean the product is safe for every material or concentration.
Defoamers and foam-control ingredients
CIP systems often need low-foam chemistry because heavy foam can affect circulation, pump performance, sensing, and rinsing. Open-plant foam cleaning has different needs because visible coverage and cling can help the crew manage application.
Which sanitizers are used on food-contact equipment?
Federal regulations identify many substances and combinations that may be used in food-contact sanitizing formulations under stated conditions.
Current 21 CFR 178.1010 includes formulations based on hypochlorites, iodine, quaternary ammonium compounds, hydrogen peroxide and peracetic acid, chlorine dioxide, organic acids, and other listed combinations. 40 CFR 180.940 addresses tolerance exemptions for ingredients in antimicrobial formulations used on food-contact surfaces.
These regulations should not be used as plant mixing instructions. Your team must follow the exact EPA-registered product label and supplier directions.
Sanitizer chemistry Why plants may select it Factors that can affect the decision
Chlorine or hypochlorite Familiar chemistry, broad labeled applications, straightforward testing Organic load, pH, corrosion, concentration loss, ventilation
Quaternary ammonium compounds Useful for many labeled food- and non-food-contact applications Detergent compatibility, water conditions, residue control, application materials
Peracetic acid and hydrogen peroxide blends Used in many food, beverage, dairy, CIP, and open-plant programs Odor, worker exposure, concentration, materials, ventilation
Iodophors Useful in selected dairy, beverage, utensil, and equipment applications Temperature, pH, staining, concentration
Chlorine dioxide Used in selected equipment, water, and processing applications On-site generation, ventilation, monitoring, product label
Acid-anionic or organic-acid systems Fit certain low-pH sanitation programs Surface compatibility, foam, pH, rinsing or draining directions
Chlorine sanitizers
Chlorine sanitizers commonly use sodium hypochlorite, calcium hypochlorite, or another chlorine-releasing ingredient.
Their performance can change when the solution contacts organic material. pH, temperature, concentration, contact time, and water chemistry also matter.
Possible concerns include corrosion, odor, worker exposure, and rapid loss of active concentration in a dirty solution.
Quaternary ammonium compounds
Quaternary ammonium compounds are usually called quats. They are used in many sanitation programs because they can be stable and practical when applied according to the label.
Quat performance may be affected by incompatible detergent residue, water conditions, organic matter, application tools, and incorrect testing.
Do not assume that every quat has the same food-contact directions. The allowed use sites, concentration, contact time, draining, and rinse instructions can differ by product.
Peracetic acid
Peracetic acid, often called PAA, is commonly supplied as a blend containing peracetic acid, hydrogen peroxide, acetic acid, and stabilizing ingredients.
It is used in many CIP, COP, spray, immersion, food-contact, and processing-water applications when the label permits that use.
Plants should review odor, ventilation, worker exposure, concentration control, elastomers, soft metals, and nearby equipment. PAA should not be treated as automatically compatible with every surface.
Iodophors
Iodophors are iodine-based sanitizer systems used in selected food, dairy, beverage, and utensil applications.
Their effectiveness and practicality can depend on pH, temperature, organic soil, concentration, and surface type. Staining can also be a concern on some materials.
Chlorine dioxide
Chlorine dioxide can be used in selected sanitation and water-treatment programs. Some systems generate it at the point of use.
A program may need controls for generation, concentration, ventilation, application, and employee exposure. The equipment and monitoring method must fit the supplier’s instructions and product label.
Does “food-grade” mean a cleaner is suitable for your equipment?
No. “Food-grade” by itself does not answer the main selection questions.
You still need to know:
Is the product a detergent, sanitizer, or disinfectant?
Is the intended use listed on the product label?
Is it permitted for food-contact or only non-food-contact surfaces?
Must the surface be rinsed?
What contact time is required?
Is it compatible with the equipment?
How will concentration be tested?
What PPE and ventilation are required?
What residue or drainage conditions apply?
A supplier statement or marketing term cannot replace the EPA label, Safety Data Sheet, technical data, equipment-manufacturer guidance, and plant SSOP.
How do you choose the right food processing cleaning chemicals?
Use the SCOPE method.
S — Soil
Identify what you are removing.
Is it protein, fat, oil, starch, sugar, mineral scale, carbonized material, allergen residue, microbial buildup, adhesive, ink, or a mixed soil?
Do not judge only by color. A cloudy stainless surface may be mineral film, chemical residue, surface damage, or remaining food soil.
C — Construction materials
List every material the chemical will touch, including:
Stainless steel
Aluminum
Galvanized metal
Copper or brass
Plastic
Rubber
Silicone
Conveyor belting
Membranes
Painted surfaces
Concrete
Grout
Electrical enclosures
Check gaskets, seals, hoses, welds, bearings, and hidden components—not only the large visible surfaces.
O — Operating method
Match the chemistry to how the equipment is cleaned:
Clean-in-place, or CIP
Clean-out-of-place, or COP
Foaming
Manual scrubbing
Soaking
Immersion
Spray application
Low-moisture cleaning
Dry cleaning
Automated parts washing
A high-foam product may be useful on an open wall but unsuitable for a closed CIP circuit. A strong CIP chemical may be unsafe for manual use.
P — Product label and people
Review the full product label, SDS, technical sheet, PPE, storage, dispensing, ventilation, spill response, and chemical-separation requirements.
The EPA states that contact time is the period a treated surface must remain visibly wet. If the surface dries too soon, the label directions may require more product.
OSHA’s Hazard Communication Standard requires employers with hazardous chemicals to maintain labels, Safety Data Sheets, and employee training. OSHA updated the standard in 2024, with later compliance-date adjustments published in 2026.
E — Evidence
Decide how the plant will prove that the process worked.
Evidence may include:
Visual inspection
Detergent or sanitizer concentration testing
Conductivity
pH testing
Temperature records
Flow or pressure records
ATP testing
Allergen-protein testing
Microbiological sampling
Final-rinse evaluation
Pre-operational findings
Corrective-action records
One test does not answer every sanitation question. For example, ATP data may support hygiene verification but does not replace a targeted allergen test or microbiological program.
How should chemicals be selected for CIP, COP, and open-plant cleaning?
CIP systems
CIP cleans internal equipment surfaces by circulating solutions through tanks, piping, pumps, valves, fillers, or heat exchangers without full disassembly.
A CIP chemical program should consider:
Flow and turbulence
Temperature at the return
Chemical concentration
Cycle time
Tank volume
Soil loading
Dead legs and low-flow areas
Spray-device coverage
Final-rinse endpoint
Recovery or single-use chemistry
Membrane and seal compatibility
A chemical cannot correct a hydraulic problem. Low flow, plugged spray devices, air pockets, or an incorrect circuit may leave soil behind even when concentration is correct.
COP systems
COP systems clean removable parts in a separate tank, washer, or controlled station.
Check:
Part orientation
Shadowed surfaces
Solution circulation
Soil loading
Basket design
Temperature
Manual brushing requirements
Rinse access
Handling after sanitation
Small parts can pass through a COP tank and still retain soil inside hollow rollers, threads, valves, or gasket channels.
Open-plant foam cleaning
Foam helps crews see coverage and gives the detergent time to work on vertical and irregular surfaces.
More foam does not always mean more cleaning. Excess foam can make rinsing slower, hide missed soil, enter electrical components, or overload drains.
Control application distance, coverage, chemical concentration, dwell time, physical action, and rinse direction.
Dry and low-moisture areas
Water can spread contamination and support microbial growth in facilities designed to stay dry. Low-moisture operations may depend on scraping, brushing, vacuuming, controlled wipes, alcohol-based products, or other site-specific methods.
Do not introduce wet cleaning into a dry area without assessing drainage, drying capability, equipment design, environmental monitoring, and the sanitation procedure.
A six-step process for selecting and testing a chemical
1. Inspect the line before choosing the product
Observe the equipment during production, teardown, cleaning, and pre-operation.
Record where soil collects, how it changes with heat, and which parts repeatedly fail inspection.
2. Identify the soil
Separate organic residue from mineral residue.
When necessary, use swabs, allergen tests, pH checks, water analysis, or laboratory support rather than guessing.
3. Map surface compatibility
Review every metal, polymer, gasket, hose, coating, and membrane touched by the chemical.
Ask the equipment manufacturer or chemical supplier for written compatibility information where needed.
4. Define the operating window
Set the intended concentration, temperature, time, flow, pressure, foam level, action method, rinse, and drying conditions.
Use the product label and technical data as boundaries.
5. Run a controlled plant trial
Test the chemistry on a defined area or cycle.
Do not change five variables at once. A controlled trial makes it easier to identify why the result improved or failed.
6. Verify and document the result
Inspect the surface and complete the correct verification tests.
When the trial works, update the SSOP, training, concentration-control method, corrective actions, and chemical inventory.
What chemical-selection mistakes cause sanitation failures?
Sanitizing before the surface is clean
Sanitizer should not be used to hide poor detergent performance.
Do this: Remove the soil, rinse as directed, inspect, and then sanitize.
Not this: Apply extra sanitizer to visible food residue.
Using one cleaner throughout the plant
A product that removes fryer grease may not remove milkstone. An acid descaler may worsen a protein-cleaning problem.
Match chemistry to each soil and area.
Assuming stronger chemistry will fix the process
Increasing concentration may raise corrosion, residue, rinsing, cost, and worker risk without correcting poor disassembly or low flow.
Check the whole cleaning process before increasing chemical strength.
Ignoring water quality
Hardness, pH, temperature, and dissolved minerals can affect detergent performance and scale formation.
Include water data when repeated deposits or concentration problems appear.
Measuring by odor or foam
Odor and foam are not concentration tests.
Use the titration, test strip, conductivity reading, or other method named by the supplier and plant procedure.
Assuming every sanitizer is “no-rinse”
Rinse and drainage directions depend on the registered use.
A product may have different directions when used as a cleaner, sanitizer, or disinfectant. Read the section for the exact surface and task.
Mixing incompatible chemicals
Acids and chlorine products must be separated. Other chemical combinations may also create heat, pressure, toxic gas, splashing, or loss of performance.
Use labeled containers, controlled dispensing, separate transfer tools, and trained employees.
Treating sanitizer as an allergen-removal chemical
Sanitizers reduce microorganisms according to their labels. They are not a substitute for removing allergenic proteins.
The allergen-cleaning procedure needs the correct detergent, physical action, rinsing, inspection, and verification method. Current FDA sanitary-operation requirements specifically address protection against allergen cross-contact.
Plant-floor example: one line, two different soils
Consider a cooked-sauce line with an oily protein film inside a mixing vessel and white mineral buildup near a hot-water rinse point.
Using only a stronger alkaline detergent may improve the greasy film but leave the mineral deposit. Using only acid may remove the white scale but perform poorly on the cooked protein.
A better program separates the tasks:
Improve teardown and pre-rinse access.
Use a compatible alkaline detergent for the organic soil.
Check time, temperature, circulation, and mechanical action.
Rinse and inspect.
Add a scheduled acid cycle for confirmed mineral buildup.
Rinse according to the procedure.
Apply the labeled sanitizer.
Verify the difficult locations before line release.
The lesson is simple: one piece of equipment may need more than one chemical step because it carries more than one kind of soil.
What records should support a chemical sanitation program?
A clear chemical file should include:
Current EPA product label for antimicrobial products
Current Safety Data Sheet
Technical data sheet
Supplier contact information
Approved-use list
Equipment and surface compatibility information
Chemical inventory
Storage map
Secondary-container labels
Dispensing instructions
Concentration limits
Test method and frequency
Test-kit expiration checks
PPE requirements
Spill and emergency procedures
SSOP references
Training records
Corrective-action instructions
Chemical-use and concentration records
Changes made after plant trials
The record should tell the sanitation employee what to do and give QA enough information to review whether the process was followed.
How Sani Process Control supports food-plant chemical programs
A chemical program should fit the equipment, soil, water, workforce, production schedule, and verification system at the facility.
Sani Process Control works with food manufacturers, processors, and packing facilities on sanitation execution, chemical selection, documented procedures, training, verification, and process control. The company positions its work as facility-specific sanitation support rather than a standard cleaning package.
Relevant services include:
Sanitation chemical sales and product-selection support
Food-plant sanitation services
Sanitation consultation and SSOP support
Process-control systems
Chemical-safety and sanitation training
Environmental monitoring and verification support
Conclusion
Food processing equipment is not cleaned with one universal chemical.
Alkaline detergents address many fats and proteins. Acid detergents address mineral scale. Neutral and enzyme products fit selected soils and surfaces. Chlorine, quats, peracetic acid, iodine, chlorine dioxide, and other labeled systems may be used during the sanitizing step.
The correct choice comes from matching the soil, surface, application method, product label, employee-safety requirements, and verification plan.
Before changing your food processing cleaning chemicals, inspect what the current program is failing to remove and determine whether the real problem is chemistry, access, time, temperature, flow, physical action, rinsing, or training.
Need help reviewing your chemical program?
Choosing the chemical is only part of the work. The product must also fit your equipment, water, sanitation method, crew, records, and verification process.
Sani Process Control can review your sanitation procedures, chemical applications, concentration controls, training, and plant-floor execution.
Request a consultation or call 1-888-859-7264 to discuss the cleaning and sanitation needs at your facility.
FAQs
What are the most common food processing cleaning chemicals?
The most common categories are alkaline detergents, chlorinated alkaline detergents, acid cleaners, neutral detergents, enzyme cleaners, chlorine sanitizers, quaternary ammonium compounds, and peracetic-acid systems. Iodophors, chlorine dioxide, and organic-acid systems are also used in selected applications.
What chemical removes fat from food processing equipment?
An alkaline detergent is commonly selected for fat, oil, grease, and many protein soils. The exact product should match the type of fat, processing temperature, surface material, cleaning method, water quality, and worker-exposure controls. Cooked or carbonized fat may require more time, heat, or physical action.
What chemical removes mineral scale and milkstone?
An acid detergent is commonly used for mineral scale, milkstone, beerstone, and hard-water deposits. The acid type and operating conditions must match the equipment materials. Confirm the deposit before treatment because an acid cleaner may perform poorly on protein or fatty soil.
Is bleach used to clean food processing equipment?
Chlorine-releasing products, including sodium hypochlorite formulations, are used in some food-plant cleaning and sanitizing programs. “Bleach” is too broad for plant instructions. The specific product, label, concentration, surface, contact time, ventilation, corrosion controls, and chemical-separation requirements must be reviewed.
Is peracetic acid a cleaner or a sanitizer?
Peracetic acid is mainly used as an antimicrobial sanitizer or processing aid in applications listed on its product label. It should not be expected to remove heavy grease, protein, or mineral buildup. The surface normally needs to be properly cleaned before the PAA sanitation step.
Are quats safe on food-contact surfaces?
Some quaternary ammonium products are registered for food-contact use under specific label directions. Others are limited to non-food-contact surfaces. Check the product’s use site, concentration, wet-contact time, draining, rinse directions, and compatibility rather than assuming every quat can be used the same way.
Do food-contact sanitizers need to be rinsed?
The exact product label determines whether a potable-water rinse is required, allowed, or not required. Do not apply one rule to every sanitizer. The label may also require precleaning, a specific contact time, adequate draining, air drying, or removal of food and packaging before application.
Which chemicals are used in CIP systems?
CIP systems commonly use low-foam alkaline cleaners for organic soil, acid cleaners for mineral deposits, and a compatible sanitizer after cleaning. The full cycle may also include water rinses and recovery steps. Flow, temperature, concentration, time, tank volume, and return conditions must be controlled.
Can sanitizer remove food allergens from equipment?
Sanitizer should not be relied on to remove allergenic protein. Allergen control depends on removing the residue with the correct detergent, disassembly, physical action, rinsing, inspection, and a suitable verification method. The sanitizer may follow cleaning as part of the broader sanitation procedure.
How often should acid and alkaline cleaners be alternated?
There is no universal schedule. Frequency depends on the products being made, water hardness, heat, equipment design, soil buildup, CIP performance, and inspection findings. Use plant data to set the frequency, then update it when scale, residue, corrosion, or verification trends change.
