When a site asks for a quote on a mobile steam cleaning machine, the model list arrives first and the facts that decide the configuration arrive later. A supplier cannot size a machine from a photograph of a bay. The details below are the ones that change the answer, and sharing them in the first message saves a round of questions on both sides.
Start with the surfaces, not the machine
Write down every surface the crew is expected to clean, and split each one by what is on it. Vehicle panels with road film, engine bays with oil film, floors with tracked-in grease and garage equipment with a film that has been baked on by repeated heat are four different problems even though they are all in the same building. Send the list with dated photographs taken from the same angle each time, because a supplier who can see the soil condition can tell you which of the three modes a mobile unit offers (dry steam, wet steam and hot water) belongs to that surface.
State the time window you are working inside
A mobile machine is chosen because work has to move, so the schedule is part of the specification. Say how many units, bays or square meters must be finished, in how many hours, by how many operators, and whether the area must be walkable again before the next shift. Drying time is a scheduling constraint, not a finishing detail, and it decides whether a lower-water mode is the right trade.
Answer the utility questions for the exact location
For each location where the machine will actually be plugged in and refilled, send: the outlet type and whether the circuit is protected, the distance from that outlet to the farthest point of work, where clean water is drawn (hose bib, sink, or a fixed inlet) and on what level, and where the run-off goes. Run-off from a degreasing job must not enter a rain drain, so tell the supplier whether there is a floor drain, an oil interceptor, or only collection trays that someone empties. Those facts decide the tank, the hose lengths and whether a mobile steam cleaning machine or a stationary unit is the honest recommendation.
Describe movement, not just floor area
A machine that fits the tasks can still fail the building. Send the doorway and gate widths, the height of any threshold, ramp gradients, steps, drainage channels, ceiling height, and how far the crew walks between the machine and the working face. Driving-style units are usually discussed for indoor garages and narrow outdoor parking areas; hand-pushed units are discussed where the route is short and the floor is clear. If operators will cross a customer-facing area, say so, because that changes the work plan before it changes the machine.
Whether the machine runs on a battery or stays tied to a supply cable is one of the biggest differences between two otherwise similar listings, so ask for both configurations to be quoted and compare them against your own route. The PowerDe PWD01 steam cleaner pages, for example, list the dry-steam, wet-steam and hot-water modes and present the model both with and without a battery; which variant fits depends on the utility answers above, not on preference.
Name what must not be sprayed
Ask the maintenance lead to sign a written no-spray list and send it with the enquiry: control cabinets and junction boxes, drives, sensors and encoders, cable chains and connectors, linear guides that carry a lubricant film, bonded insulation, vents and breathers, airbags and seat mechanisms, cameras and radar, and any item under an active repair tag. A supplier who receives this list can recommend lance, nozzle and technique; a supplier who does not will sell you a machine and leave the restrictions to be discovered on the first job.
Ask who states the measurement conditions
Temperature and pressure figures mean little unless someone says where they are measured and which mode they belong to. Ask each supplier to write the measurement point (boiler, gun or nozzle tip) and the mode, and to state heating power, water-tank capacity, working voltage and the water-inlet fitting in the same table. Ask them to name the protection functions on the machine and to confirm in writing that a protection trip must be investigated and recorded rather than reset repeatedly. If you want a fixed comparison, request that every quotation repeat the same field names, and leave blanks where a supplier does not answer instead of filling them in for them.
Define the trial before you choose
Ask for a trial on your own worst surface, run by your own crew, in an isolated window. Fix the nozzle, distance, pass count, dwell time and any detergent dilution, and record them so the run can be repeated. Agree the pass criteria in writing beforehand: no film left when wiped with a white cloth, no blistering or discoloration on paint, no water ingress found on a re-check of seals, floor walkable again within the window you stated. Judge the result against your current method timed on the same surface, not against a catalogue.
Close with the site facts, not a model number
If nothing in the published range matches the utility facts and the no-spray list, stop comparing models and send the working information instead: the surface list, soil photographs, the timed record of your current method, the power and water facts for each location, and where the run-off is allowed to go. That is the input for customized steam cleaning equipment, and it is also what to attach when you contact PowerDe to ask which configuration your site actually needs.
