Start with the constraints you already have
Write down four facts before you look at a single specification sheet. First, where washing actually happens: an indoor garage bay, an open parking lot, a depot with a wash pad, or a curbside in front of a customer. Second, what the surface is: painted panels, aluminium trailer skin, engine bays, plastic trim, cab interiors. Third, what the soil is: road film, mixed traffic film, diesel soot, food residue, agricultural dust, grease. Fourth, what is fixed and cannot change — the power supply at the position, the water supply, ceiling height, the distance from the water tap to the wash point, and the shift pattern the machine must fit into.
Those four answers decide which of the three configurations on the market fits: a fixed unit that stays on one position, a hand-pushed unit that a technician moves between positions, or a self-propelled unit that travels with the vehicle. PowerDe's Cleaning Equipment Series covers all three — a fixed unit, hand-pushed units with and without battery, and driving-style units with and without battery — and the split is worth reading carefully, because the battery option changes what a wash cycle costs in labour, not how clean the panel comes out.
Test 1: does the equipment fit the space you can offer it?
Take a tape measure to the wash position and check three clearances. Door width and lift height decide whether a fixed unit can be delivered and serviced. The turning radius in the bay decides whether a mobile unit can reach the far corner of a long vehicle without being repositioned by hand. Floor drainage decides whether steam or hot water can be used where it is fastest, or whether runoff has to be contained in a tank.
Read the published footprint before you commit. The fixed PowerDe HW02 steam cleaner is listed at 1,200 × 800 × 1,200 mm including handles, with an 80 L SUS304 tank, a tap-water inlet using a 4-point internal-tooth joint (1/2 inch), 220 V working voltage, and dry/wet steam modes with a vacuum cleaner included. The driving-style PowerDe PWD02 steam cleaner is listed at 1,275 × 570 × 1,185 mm with a 60 L clean-water tank and hot water, dry steam and wet steam modes. Two things matter more than the numbers themselves: whether the inlet connection matches the hose already on your supply, and whether the machine can be moved, lifted and serviced by the crew you actually have on shift.
Test 2: does the mode you need actually exist on that machine?
Steam, wet steam and hot water do different jobs, and a fleet usually needs more than one. Dry steam carries heat with little moisture, which suits surfaces and components that must stay close to dry — engine bays, electrical surrounds, interior trim. Wet steam adds moisture to loosen bonded film. Hot water moves volume and is what most people expect when they picture a wash. The fixed HW02 is specified for dry and wet steam; the driving-style PWD02, PWD01 and HMW2 models are specified for hot water plus dry and wet steam. If your fleet's real bottleneck is a fast panel wash rather than a detail or an engine bay, that difference in mode range should decide the model long before price does.
For a mixed fleet, the honest answer is often two machines on two positions: a fixed unit where detail and engine-bay work is repeated, and a mobile unit where vehicles are washed where they park. Ask the supplier to price both configurations for one site and compare the labour they consume across a week, not the sticker of either one.
Test 3: run a pilot on your worst three vehicles
Choose three vehicles on purpose: one with ordinary road film, one with the soil type your fleet is worst at (grease, soot, food residue, mud), and one with a finish you are nervous about. Run the same wash order on each, and record three things for every vehicle: time from start to hand-back, whether any panel needs a second pass, and whether anything downstream got slower — drying, polishing, or the driver waiting for the vehicle.
Keep the comparison honest by timing the existing method on the same three vehicles in the same week. A change that saves twenty minutes per wash but adds a rinse-and-wipe step somewhere else has not saved anything. If the pilot runs on a supplier demo unit, ask them to bring the tank size and power supply you have, not an ideal one.
Test 4: check the safety and service envelope, not just the cleaning result
Steam and high voltage travel together in a wet working environment, so the safety package belongs in the same evaluation as cleaning quality. PowerDe's product pages list leakage protection, short-circuit protection, high-temperature protection, high-voltage protection, water-shortage protection and high-voltage explosion protection on the HW02 and PWD02 models, and the driving-style models use a PTC semiconductor heater. Treat the list as a specification to verify with your own electrical inspector: confirm the supply earthing at the position, the RCD rating, and which protective functions the machine relies on locally rather than internally. A machine that trips your circuit every shift will not survive its first month, however well it cleans.
Then check consumables and serviceability while the machine is still a quotation: how the tank is cleaned, how nozzles and seals are replaced, who holds spare parts, and what happens when a unit is out of service on a Saturday morning. Write the answer into the purchase conversation, because downtime is the hidden cost in every fleet cleaning trial.
Test 5: confirm what the water and detergent rules in your area allow
Steam and hot-water cleaning reduce both water volume and chemical use, which is exactly why fleet buyers start looking at it. But local rules on runoff, oil separators and discharge points do not change because the machine uses less water. Confirm, in writing and before installation, where the runoff from your chosen position may go, whether a containment mat or recovery system is required, and whether the site's existing drainage already satisfies that. If your site has a sealed wash pad, ask the supplier to design the cycle around the pad, not around a generic demonstration.
Test 6: price the labour change, then decide the rollout order
Now the business case can be written: vehicles washed per shift, minutes per vehicle, technicians per shift, and what the freed minutes are worth — vehicles returned earlier, or fewer evening shifts. Compare fixed versus battery-equipped variants on that arithmetic. Battery-equipped driving-style models exist so a crew can move between positions and keep the cycle running in a narrow yard; whether that saves money depends entirely on how far your positions are apart.
Roll out one position first, write the wash order down while it is fresh, and only then copy it across the fleet. Buyers who trial on one site and standardise afterwards keep control of both the budget and the training; buyers who equip every depot at once discover the process problems in twelve places at the same time.
The shortlist to send to a supplier
Ask any supplier of PowerDe cleaning equipment the same six questions, and the comparison becomes simple: which configuration matches my space and power supply; which cleaning modes my soil actually needs; whether a demo can be run on my three worst vehicles; which protective functions are specified and how they must be wired locally; what the service and spare-parts commitment is; and what the site's drainage rules require. If all six answers arrive in writing and the pilot on your own vehicles holds up, the decision stops being a gamble on a new technology and becomes a normal equipment purchase — which is exactly how it should be evaluated.
