In a school kitchen the person signing off a cleaning job is rarely the person who did it. A site manager, a catering supervisor, a business manager, sometimes an environmental health officer on a visit — each wants to see evidence that the equipment is clean, and none of them watched the shift. Acceptance criteria are what turn "we cleaned it" into something those people can check in a few minutes without arguing. The steps below work for any commercial steam cleaning equipment regime in a kitchen that serves children on a schedule it cannot postpone.
1. Write the equipment list before you write the standard
A school kitchen has a predictable set of items: range and oven exteriors, griddle and salamander surfaces, the extraction hood and its visible filters, the sink and drainer, the preparation bench, trolleys, shelving, the dishwasher's external surfaces and its door seal, and the floor immediately around each of them. Write that list item by item. Every criterion then attaches to a named item rather than to a shift, and a missed item becomes visible instead of invisible.
Mark each item with what it can tolerate. Electrical housings, control panels, cable entries, motor housings and any open enclosure must stay dry. That decision belongs on the list before an operator improvises it with a nozzle in hand.
2. State the standard for each item in one checkable sentence
"Clean" is not a standard. "No visible residue on the horizontal lip of the range, and no transfer on a white cloth drawn across a 300 mm pass" is. Write the pass condition per item in the words an inspector would use, and keep the check short enough that a busy supervisor will actually perform it: visual, cloth, and touch. For anything the children touch directly, add a sanitation step and name it; for high surfaces and the exterior of ducting, state that the criterion is grease removal and how thick a deposit is a fail.
Include a fail condition with teeth. If a criterion has no consequence, it is decoration — say what happens: the item goes back on the list, the crew returns, the record notes the failure.
3. Set the criteria from a trial on your own kitchen, not from a brochure
Standards copied from a datasheet fail because a datasheet describes a demonstration. Run a controlled trial in your own kitchen on a normal dirty day: photograph the easiest item and the worst one, clean both with the agreed method, photograph both again, and time the job from set-up to clean-down including refills and run-off handling. If the two results diverge — they will — you need two standards, not one averaged routine. School kitchens make this easy: the term break gives you a low-traffic day to test the deep-clean method without serving children.
4. Put the machine's real limits in the same document
A criterion implies a capability. Heat and dwell are what lift baked-on grease, so the document has to state what the machine delivers. As an example of the figures to ask a supplier for, the central kitchen cleaning equipment page for the PowerDe HW02 lists 220 V supply, 6 kW heating power, 160 °C steam temperature, 0.8 MPa vapour pressure and an 80 L tank. Compare those against your kitchen: which circuit is available near the work, where the water connection is, and how far the hose has to reach. A criterion that requires heat the installed machine cannot sustain is a criterion the crew will fail every week.
Anything the page does not publish — hose and wand reach, weight, runtime on battery models, refill frequency — stays an open question, and open questions get closed in writing before an order is placed.
5. Add the two criteria kitchens forget
Run-off: where the grease-laden water is collected and how it leaves the building. Steam uses little water, which is exactly why teams assume the run-off is trivial; what comes off a hood is concentrated and it will find its way into a floor drain, under a doorway or across a serving route if nobody planned for it.
Time to dry and time to re-open: a school kitchen re-opens at a fixed hour. The criterion is not "cleaned by 4 pm" but "floor dry and safe for foot traffic before the next session". Measure that once in your own kitchen with your own ventilation, then put the figure in the schedule. A floor that passes a visual check and is still slick has not passed anything.
6. Record it on a sheet the supervisor signs
One line per item per cleaning event: date, operator, method, pass or fail, signature of the person who checked, and a photograph for any item that failed and was re-done. Keep it on a laminated sheet by the door or in the app the team already uses — not in a folder nobody opens. Two terms of that record tell you which criteria are real and which were aspirational, and it is the file you put in front of a visitor instead of a conversation.
7. Hand the criteria to suppliers before they quote
Send the criteria page with the enquiry, not after the machine arrives. Ask which items each model is cleared for and which must stay dry, what the documented temperature, pressure and tank capacity are for that exact model, what installation the kitchen must provide, and what service interval, spares and operator training come with delivery. A quotation that answers your criteria page is comparable; a quotation that answers a brochure is not.
A named equipment list, one checkable sentence per item, a trial on your own soil, the machine's published limits, run-off and drying rules, and a signed sheet — that is what an acceptance criterion is. Everything else on the wall is a slogan.
