Ask three kitchen cleaning contractors for a quote and you get three different definitions of a clean hood. One promises "spotless", another prices by the hour, a third prices per panel. None of those numbers lets a facility manager decide whether the work was done. An acceptance criterion is a written statement of what must be true after cleaning, plus the evidence that proves it. Without one, the buyer cannot reject poor work and the honest contractor cannot prove good work. Below is the way we build those criteria for restaurant groups, central kitchens and food plants that contact us about central kitchen cleaning equipment. Shenzhen PowerDe Automation Precision Equipment Co., Ltd., established in Shenzhen in 2007, builds steam and hot-water cleaning machines for commercial and industrial use, and we set the same kind of criteria before we recommend a machine for your kitchen.
Start with the surface list, not with a cleaning schedule
Acceptance criteria fail when the scope is written as "the kitchen". A kitchen is a set of surfaces with different access, different soils and different consequences when the soil stays. Write the list first, one row per item:
- Externals you touch daily: stovetop surrounds, griddle and grill bodies, fryer housings, prep tables, knobs and handles.
- Externals you touch monthly: oven and combi-steamer casings, exhaust hood outer surfaces, splashbacks, shelving frames.
- Parts removed for cleaning: hood filters, grease cups, baffle sections, fan housings where the design allows removal.
- Parts cleaned in place: hood interiors, duct accessible through inspection ports, fan wheels, floor drains, wall tiles behind the line.
- Floors and gutters: the cooking-line floor, floor gutters, the strip behind equipment where grease tracks accumulate.
Each row then gets its own criterion. A criterion for a hood interior and a criterion for a stainless prep table are not the same sentence with a different noun; the first is about grease thickness and fire risk, the second about a visible film on a surface near food contact areas.
Write criteria a person can judge, not a feeling
A usable criterion has three parts: the condition, the zone it applies to, and the frequency of checking. Phrases such as "clean and hygienic" fail because two inspectors read them differently. Compare:
- Not usable: "Hood to be left clean."
- Usable: "Baffle panels: no soft, removable grease deposit; bare metal visible on a wiped test area; checked on every baffle after cleaning and photographed."
- Usable: "Griddle body and surround: no sticky film when a gloved hand runs the full height of the side panel; checked before the equipment returns to service."
- Usable: "Cooking-line floor and gutter: no grease slip underfoot and no visible grease ribbon in the gutter; checked at handover with a walk of the line."
Where the item is hidden, the criterion changes to access and record rather than appearance: "Duct: inspection ports opened and closed; where a port shows deposit build-up, that section is added to the next cleaning scope and recorded with its location." This keeps a buyer from paying for a standard that cannot be seen and keeps a contractor from being blamed for a condition outside the scope.
Decide the pass or fail rule, then decide how it is checked
For each item, set two thresholds: one for full cleaning and one for the intermediate routine clean. A central kitchen running two shifts usually cannot strip a hood every week, so the weekly criterion must be one that keeps the deposit from turning into a hard baked layer. A practical way to set it:
- Name the test. Visual inspection of a defined area; a wipe of a defined area with a white cloth; a gloved-hand pass; a bare-metal check on a wiped patch.
- Name the area. "Upper left baffle", "right-hand fryer side panel", "gutter under the grill" — not "the hood".
- Name the number. How many items must pass for the job to be accepted, and what happens to the ones that fail. Two failed baffles out of six means the job is not accepted, the failed items are re-cleaned and re-checked, and the record shows the second pass.
- Name the evidence. Before and after photographs of the same framing, a signed handover sheet listing every item, and the re-clean entries.
Inspection has to happen while the equipment is still exposed and before the kitchen reopens. A criterion checked the following morning, with the line in production, is a criterion nobody applies.
What high-temperature steam changes in the criteria
Conventional scraping, solvent and hot-water washing produce the same acceptance problem from a different direction: chemical residue, displaced grease, and a surface that is wet and greasy at the far end of the kitchen. Our machines take a different route. The Fixed Steam Cleaning Machine PowerDe HW02 is listed at 160 °C steam temperature and 0.8 MPa vapour pressure with 6 kW heating power and an 80 L SUS304 tank, running on 220 V mains with tap water fed through a 4-point internal-tooth joint (1/2 inch). On heavy cooking grease, that combination of heat and pressure is what turns a baked film into a film an operator can lift, so your criteria can move from "no visible lumps" to "no soft removable deposit, bare metal on a wiped patch".
Two things matter in the specification when you are writing the criteria rather than buying the machine:
- Mode selection. The HW02 page lists dry and wet steam, plus a vacuum cleaner. On a kitchen line, dry steam is the mode for electrical housings, control panels and areas where you cannot afford free water; wet steam is the mode for soaking a heavy deposit. A criterion that demands "no standing water on or around the equipment at handover" is only achievable if the machine lets the operator dial moisture down.
- Protection and utilities. The HW02 page lists leakage, short-circuit, high-temperature, high-voltage, water-shortage and high-voltage-explosion protection. For your site, confirm the power point, the tap-water connection and the drainage before the criterion is written, and add those checks to the site-readiness list rather than to the cleanliness list.
Material and safety limits belong inside the criteria
A criterion that ignores the equipment's own construction creates damage and a warranty argument. Before any steam work on kitchen equipment, confirm with the equipment manufacturer or a test on a hidden area:
- Sealed assemblies. Burner controls, ignition modules, thermostats, electrical housings, wiring and junction boxes. Clean these with the power isolated and no free spray; steam, if used at all, is applied to the outer surface with the operator following written instructions, not to openings.
- Insulation and gaskets. Door seals, gasket lines and any insulated panel where water can enter behind a joint. The criterion here is that seals and joints are intact after cleaning, checked by hand, not just that they look clean.
- Coated and painted parts. Powder-coated casings and older painted surfaces can be softened by heat and by aggressive wiping. Set the criterion as "coating intact, no lifting at edges" and test on a hidden area first.
- Food-contact surfaces. Cooking surfaces that touch food are cleaned and finished to the food-safety procedure your kitchen already follows. Steam cleaning is a method for removing grease; the sanitising step required by your HACCP-based routine stays in place. A degreasing method must not be written into the criterion as a substitute for that step.
The same care applies to the floor. A commercial kitchen floor steam cleaning job is judged with a slip check as well as a visual one, and drainage is part of the handover condition, not an afterthought.
Build the record that supports the decision
One page per visit, one row per item. Keep the record simple enough that a supervisor completes it without a printer:
- Item and location as written in the surface list.
- Criterion applied and the test used.
- Result: pass, fail, or not accessible, with the reason.
- Action taken on a fail and the result of the re-check.
- Before and after photographs for any item that failed or that was not in the previous record.
- New findings — a duct section not previously scoped, a damaged seal, a baffle that no longer seats correctly.
Keep the record where the fire officer, the insurer's surveyor and the next cleaning contractor can be shown it. Consistency across three visits is worth more to all of them than a single excellent visit.
Questions facility managers ask us about acceptance
Should we accept on the contractor's report or our own inspection?
Both, with your own inspection as the deciding one. The contractor's report tells you what they intended to do; your walk of the line against the surface list tells you what is there. If you do not have staff available at handover, agree in advance which named person signs the sheet and when the walk happens.
How often should the criteria themselves be reviewed?
Review them whenever the menu, the equipment or the shift pattern changes, and otherwise at least annually. A change in frying hours changes how fast a deposit builds, which changes whether the weekly criterion still holds.
Can one set of criteria cover every site in a group?
One framework, yes; one list of areas, no. Site A may clean baffles weekly and Site A's criterion will be tight; Site B may need a monthly strip clean and a looser weekly criterion. Keep the format identical so the two sites can be compared, and let the areas and frequencies differ.
What if equipment is damaged during cleaning?
The condition report and the surface list are what settle it. Record the pre-clean condition of seals, coatings and control areas for any item that will be steam cleaned. If a coating lifts, the record shows whether it was already failing at the edge. This is also why operator training and written work instructions on nozzle distance and permitted zones belong in the contract as well as in the criteria.
Does a steam machine remove the need for chemical degreasers?
For the heavy grease film on equipment exteriors, hoods and baffles, heat and pressure are usually enough, and that is the basis on which we specify these machines. For food-contact surfaces and for the sanitising step, keep the procedure your food-safety system already requires. We are deliberately precise about that distinction with customers comparing PowerDe cleaning equipment, because an acceptance criterion that assumes steam does the sanitising job will fail an audit.
If you are setting or revising acceptance criteria for kitchen cleaning, send us the equipment list, the cleaning frequency you currently run, and the last two contractor reports. We will tell you which items a high-temperature steam method can realistically hold to a "no soft removable deposit" standard, which items should keep a lower-frequency strip-clean criterion, and what site conditions — power point, water point, drainage and turnaround window — have to be settled first. Our engineering team can also arrange a trial on your own equipment so the criteria are tested against a real deposit rather than a description of one. Talk to us about central kitchen degreasing options through the contact page or write to sales@powerde.net.
