Most cleaning trials fail because nobody prepared anything. A machine arrives, a couple of vehicles are washed, somebody says it looks fine, and the trial ends with no decision. Six months later the same conversation starts again from nothing.
A trial is only worth running if it produces a comparison. That means the fleet has to arrive at the trial in a state where the difference between methods is visible, and the staff have to know what they are recording. This is the preparation we would ask a transport or depot team to do.
Pick the vehicles that show the difference
Do not send the cleanest vehicle in the yard. Choose a small set of vehicles that represent the real range of the fleet: one that comes back with road film and dust, one with oil or grease around the chassis and wheels, and one with the hardest job you actually run — a hopper, a tipper body, a refuse body, a tank shell or a refrigerated box. Keep the same vehicles for the whole trial so the comparison is with themselves, not with each other.
Agree in writing which surfaces count as the pass or fail, and photograph those surfaces before anything is cleaned. A trial with no before photographs has no result.
Prepare the vehicle, not just the surface
Operators should do the routine pre-clean steps before the wash crew starts: loose debris swept out, loads secured or emptied, and any loose items removed from the cab and the load area. Anything that has to be protected should be masked or covered first — the same list you would use for any wash: electrical connectors, sensors, number plates, air intakes, exhaust openings, camera housings and stickers that should stay legible.
Set the boundary on the engine bay and the chassis electrics before the trial and write it on the sheet. Whether a unit is used on an engine compartment is a decision for the method, not something the operator improvises; the product pages state the intended uses per model, so confirm that the model you are trialling is listed for that work before you start.
Confirm the site can support the machine
A trial stopped by plumbing is a wasted week. Before the machine arrives, check three things: where the water comes from and whether the inlet connection matches your supply, where the run-off goes and whether it is allowed there, and whether the route from the delivery point to the wash position is clear. For a fixed unit, confirm the working voltage and the supply arrangement in the specification table.
A mobile truck steam cleaner that carries its own clean water tank and can be driven to the vehicle changes that checklist: the wash can happen where the truck is parked instead of in a fixed bay, and the refill point becomes the constraint instead of the hose run. Check whether the variant on trial is supplied with a battery or without one, so charging does not become a surprise on day two.
Decide what staff record, before the first wash
Keep the sheet to five columns so it gets filled in: vehicle identifier, start and finish time, refills or water used, chemical volume, and the pass or fail against each named surface. Add one line for problems — anything the crew had to stop for. A trial of this kind is as much a test of the workflow as of the result, and the stoppages are the data that tell you whether the process fits a shift.
Run the same vehicle type twice if you can — once with the normal method and once with the trial method — with the same crew and the same finish standard. If only one method is used, there is nothing to compare against. The commercial steam cleaning machine options on our site are listed by category with the specification table for each model, so you can match the modes in the trial to the model that carries them.
Close the trial with a decision, not an impression
At the end, put the photographs and the sheets side by side and answer three questions: did the surfaces meet the standard you wrote before the trial, did the process fit inside the shift, and what does one vehicle cost in time, water and chemical. If any answer is unclear, run the trial again on the same vehicles rather than widening it.
Send us the vehicle types, the surfaces you inspect, your water and power supply and the shift pattern, and we will tell you which modes and which unit suit that trial before it starts.
