A steam-cleaning trial in a working kitchen fails for two reasons: the machine is not ready when the shift window opens, and the surfaces were never defined as test pieces. This checklist covers both sides, so the crew, the equipment and the surfaces arrive at the same moment and the trial produces numbers you can reuse rather than an impression.
Write the task down before anyone touches a spray gun
Commercial cooking lines are not cleaned as one object. Each piece of equipment splits into a filter or baffle that holds old grease, an interior cavity that has been heated and cooled many times, an outer panel that guests or staff can see, and a fan or motor end that nobody should spray. Write those faces separately on the trial sheet, and take photographs from a fixed position and angle for each face so the before state matches the after state. Without a fixed camera position, two people will describe the same hood differently and the trial result becomes a matter of opinion.
Next to each face, record what the soil is doing, not what it is called. Fresh grease that is still soft, aged grease that has turned tacky, and grease mixed with dust or flour behave differently under heat and require different waiting time. This single distinction explains most disappointing trials, because a crew that treats all grease the same will spend the same time on a tacky surface that needs softening first.
Get a signed list of parts that must not be sprayed
Before the trial, have the maintenance or facilities lead write and sign a no-spray list for the equipment under test. In a kitchen this usually includes lamps and their wiring, fan motors and their cable entries, control panels and thermostats, junction boxes, bearing housings, insulation joints, open ductwork, fire-related parts and dampers, and any gas or electrical connection that has not been isolated. The list matters more than the machine specification: it decides which nozzle and which technique are allowed near each face, and it protects equipment that a later inspection would otherwise find wet inside.
Cool the equipment and isolate it for the trial. A surface that is still hot from service changes how heat and moisture behave on it, and a fan that can start during work makes the trial unsafe. Record who isolated what and who put the tag on it.
Choose one mode and freeze the numbers that describe the technique
A trial is not a chance to improvise. Decide before it starts which mode you will use and keep it constant across the test faces. The Cleaning Equipment Series pages list machines that switch between dry steam, wet steam and hot water, which means your kitchen, not the catalogue, has to decide which of those the trial answers; read that list as the range of options available, not as a claim that one machine suits every face in your kitchen.
Then freeze four numbers that describe how the gun is moved: nozzle distance, travel speed, number of passes, and how long the heat stays on the soil. If the trial uses a fixed steam cleaning machine, those four numbers are also what tells a supplier whether the gun and hose that come with it reach the faces on your list. Write them on the sheet and have the operator sign that they used them. If those four numbers are not fixed, a second attempt at the same task proves nothing, and the supplier cannot tell you what to buy because there is no method to quote against.
Prepare water, drainage and the floor before the shift window opens
Kitchen trials stall on utilities far more often than on cleaning power. Confirm where the machine will be refilled, whether the tap thread matches the machine inlet, and how far the operator walks for water during a shift. The fixed machine listed for this kind of work states a 220 V supply, 6 kW heating power, an 80 L SUS304 tank and a tap-water inlet using a 1/2 inch 4-point internal-tooth fitting, and it lists leakage, short-circuit, high-temperature, high-voltage and water-shortage protection. Those figures describe the installation the machine asks for; they are not a promise that a particular surface in your kitchen will come out clean, and you should still ask the supplier to state which mode each figure belongs to and where temperature and pressure are measured.
Decide where the run-off goes. Grease-laden water should not enter a rain drain, so plan trays or a collection point and confirm whether the site route reaches an interceptor. Protect the floor around the work area, keep the cable off walkways, and treat drying time as part of the schedule rather than an afterthought: a floor that is clean but not dry cannot take staff back into service.
Assign roles and write the pass test before the trial starts
Name the people: who holds the gun, who collects loosened residue, who refills and watches the machine, and who signs the result. Steam work in a kitchen needs the right personal protective equipment for hot vapour and a rule that nobody works a ladder alone. Then write the pass test in observable terms: bare metal visible on a treated face, no film when wiped with a clean white cloth, no blistering or discoloured coating after the surface has dried fully, no water found inside the parts on the no-spray list on the next inspection, and the floor dry within the time the schedule allows.
Ask the supplier to state their expected result for the same faces in the same conditions, in writing, before you compare it with your own numbers. That request also forces them to describe the method behind their claim.
Measure the trial against your current method, not against a brochure
Run the trial on the dirtiest piece of equipment you own, with your own staff, inside a window you have already isolated. Record four numbers for that equipment and compare them with the method you use today: labour minutes per face, how many times the machine had to be refilled or the cable moved, and how long the surface took to dry enough to return to service. A method that saves effort but leaves a wet floor for longer has not saved anything, and only your own timing will show that.
Keep the machine on the list of equipment that needs upkeep. Tap water leaves scale inside heaters and generators, and scale shows up as weaker output and more refilling rather than as an obvious breakdown. Agree who owns the descaling interval, check inlet filters, and keep consumables such as nozzles, seals and hoses with part numbers and lead times. If a protection function trips during the trial, record it and have the machine checked instead of resetting it repeatedly.
If the site does not fit a standard machine, send a brief instead of a model number
When the trial shows that your layout, taps or windows do not match a standard machine, treat customisation as the finding rather than the assumption. A site survey conversation about customized steam cleaning equipment is more useful when it arrives with your face list, photographs, signed no-spray list, utility notes and the timed trial sheet attached.
Turn the trial output into one page: the faces, the soil type for each, the frozen mode and four technique numbers, the pass test, the drying time, and who signs. That page is what you train new staff from and what you hand to a supplier when the kitchen runs more than one site. If you want a second opinion on which faces in your commercial kitchen steam cleaning programme are worth a first trial, send the face list and photographs and ask for the method behind the answer.
