Quick answer: Commercial kitchen deep cleaning is one of the most regulated cleaning activities in the UK. EHO inspectors check not just whether the kitchen is clean but whether the cleaning process was carried out correctly -- at the right temperature, with documented chemical records, and with wash water disposed of compliantly. Hot water pressure washing at the correct temperature is the standard for food contact surface deep cleaning. Wash water from a commercial kitchen contains fats, oils and biological matter and must go to foul sewer with trade effluent consent -- not to a surface water drain. COSHH assessments for all chemicals used must be current and reflect August 2026 GB CLP classifications. This guide covers the complete professional deep clean process.
Commercial kitchen deep cleaning is a specialist activity that sits at the intersection of food safety law, COSHH compliance and environmental permitting. Getting it right keeps clients through EHO inspections. Getting it wrong creates enforcement risk for both the kitchen operator and the cleaning contractor.
Before you start -- site preparation
- Schedule during non-service hours -- commercial kitchen deep cleaning must be carried out when the kitchen is not in food production. Typically overnight or on a rest day.
- Remove all food from the area -- open food must not be present during cleaning. Sealed food in refrigeration is acceptable providing the fridges are not opened during chemical application.
- Switch off and isolate electrical equipment -- fryers, ovens, grills, hot plates, refrigeration condensers. Pressure washing near live electrical equipment creates an electrocution risk. Ensure the maintenance team or client has isolated equipment before cleaning begins.
- Check drainage -- identify whether kitchen floor drains connect to foul sewer (required for wash water disposal) or surface water. Confirm trade effluent consent is in place for the site.
- Set up PPE -- chemical-resistant gloves, eye protection, non-slip footwear, waterproof coverall where required by the SDS.
The correct cleaning sequence -- work top to bottom
Always clean top to bottom -- extract canopy and filters first, then walls and surfaces, then equipment, then floor last. Cleaning the floor first and then disturbing canopy filters that drop grease deposits onto the clean floor is a waste of time and an EHO inspection failure.
1. Extract canopy and filters
Remove filters and soak in degreaser solution. Clean canopy interior with degreaser and wipe down. Grease-laden canopies are a fire risk -- regular deep cleaning is a fire safety as well as a hygiene requirement. Filters should be inspected and replaced if damaged.
2. Walls, splash backs and surfaces
Degrease tile and stainless steel splash backs. Work from top to bottom. Rinse with hot water -- a hot water pressure washer at controlled pressure is effective for stainless surfaces. Do not use pressure washing directly onto tiled walls where the grout is degraded -- damaged grout is a harbour for bacteria and needs to be repaired before it can be cleaned effectively.
3. Cooking equipment
Fryers, grills, ovens and ranges require specific degreasers appropriate for the surface. Stainless steel should be cleaned with the grain to avoid micro-scratches that harbour bacteria. Rubber seals on oven doors require careful chemical selection -- some degreasers degrade rubber. Check the equipment manufacturer guidance.
4. Refrigeration units
Clean refrigeration unit interiors with a food-safe sanitiser. Check door seals for mould -- mould growth on refrigeration door seals is a common EHO finding. The condenser coils on the back or underside of fridges should be cleaned with a low-pressure air blast or vacuum -- not water.
5. Floor -- hot water pressure washing
Commercial kitchen floors are the final cleaning stage. Hot water pressure washing at 70-80 degrees C is effective for removing grease, food deposits and biological contamination from quarry tile and vinyl kitchen floors. A surface cleaner attachment provides even pressure distribution and prevents grout damage from direct lance use. Drainage channels should be cleaned last and degreased before final rinse.
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Wash water management
Kitchen deep clean wash water contains fats, oils, detergents and biological matter. It is trade effluent. It must go to foul sewer -- with trade effluent consent -- not to a surface water drain. On sites where the floor drains connect to surface water, containment and removal by licensed waste carrier is required. See: Environmental Permitting guidance
EHO-ready completion records
After a commercial kitchen deep clean, the client should receive a completion record covering:
- Date and time of clean
- Areas cleaned and method used for each
- Chemicals used -- product names, dilution rates, SDS references
- Water temperature used for hot water applications
- How wash water was managed and disposed of
- Any defects found (damaged grout, mould on seals, equipment damage) requiring further attention
- Operative name and signature
This record is what the EHO inspector will ask to see when reviewing the kitchen cleaning programme. A client who cannot produce it is at risk of a Food Hygiene Rating downgrade regardless of how clean the kitchen looks on inspection day.
Related guidance
Food and beverage manufacturing hub | Food production cleaning and FSA enforcement | Environmental Permitting | COSHH Regulations 2002 | Chemical reclassification August 2026
