When a depot manager is asked to put a number on truck exterior cleaning, the question usually comes back as a single line: what does each wash cost? That number is hard to pin down because the answer changes with the fleet, the surface area, the soil load and the way the wash crew works. A useful evaluation starts by breaking the job into the cost lines a purchasing team can actually audit, then comparing methods against the same workload.
Start with the workload, not the machine
Before any equipment is quoted, write down what the facility actually washes. A mixed fleet of box trucks, tankers and yard tractors does not clean the way a fleet of delivery vans does. Record the number of vehicles washed per day, the panel area per vehicle, how often the fleet is cleaned, and what kind of soil the cleaning has to remove — road film, grease around the chassis, food residue on a tanker, or just dust. Facilities that wash in cold weather or that must clean in indoor bays without floor drains face a different set of constraints. These inputs decide the labour time, the water handling and the equipment class, so getting them wrong is the most expensive mistake in the evaluation.
The cost lines to add up
For a per-wash cost model, track the following:
- Labour hours per vehicle, including prep, rinse, wash and the walk-around afterwards.
- Water volume, how it is supplied and heated, and what happens to the runoff.
- Detergent, degreaser and consumables such as brushes and cloths.
- Energy used to heat water or raise steam, and the duty cycle that comes with it.
- Equipment purchase or lease, plus service, wear parts and downtime.
- Water containment, permits and any local discharge requirements the site must satisfy.
- Rework — vehicles that go back through the wash because the first pass missed the soil.
Labour and rework are the two lines most often under-counted. A wash that leaves grease at the wheel arches or streaks along a cab door gets repeated, and the repeat pass carries the same labour cost as the first one. When the model includes rework, a method that removes heavy soil in one pass often wins on total cost even when the machine itself is more expensive.
Compare methods on the same workload
A high-pressure cold-water wash is cheap to buy and quick on light dust, but on road grease it leans on detergent dwell time and scrubbing labour. A hot-water or steam unit shifts cost from labour and chemicals to energy: the heat does the work the detergent and the brush would otherwise do. That trade matters most where soil is greasy, where the site wants to limit chemicals, or where water volume has to stay small because there is no drainage and the runoff must be collected.
A truck steam cleaning equipment setup changes the water picture as well. PowerDe's fixed steam cleaning machine HW02 is listed in the cleaning equipment series as a 220 V unit; the detail page states 6 kW of heating power, 160° steam temperature, 0.8 MPa vapour pressure, an 80 L SUS304 tank, and dry-steam and wet-steam modes together with a vacuum function. Those are the figures to enter in the energy and water lines of the model, and they should still be confirmed against the current datasheet before any quotation is issued.
Match the machine to where the wash happens
Fixed units suit a set wash bay with power and water connections and a defined drainage arrangement. Where vehicles are washed wherever they are parked, a mobile unit changes the labour calculation because the crew walks less and the vehicle does not have to be moved. PowerDe lists PowerDe PWD02 steam cleaner models as mobile active-water machines with dry-steam, wet-steam and hot-water modes for indoor garages and narrow outdoor parking spaces, in battery and non-battery variants, and PowerDe HMW2 steam cleaner in the same mobile class. For a yard with no dedicated bay, that mobility shows up in the labour line, not on the spec sheet.
Fleet exterior work sits in the PowerDe cleaning equipment range alongside units listed for other commercial and industrial settings, which is useful when one maintenance team covers both vehicles and fixed plant.
Do not leave the indirect costs out
Runoff handling, permits and the time lost when a wash bay is out of service belong in the comparison. A method that uses less water reduces how much runoff has to be collected and disposed of. A unit that heats slowly or must recover between vehicles adds idle minutes per wash, and those minutes are labour the model should see. Ask any supplier for the duty cycle and heat-up behaviour, not just the power rating, then price the idle time as labour.
Run a controlled trial before you sign
Pick a representative group of vehicles, hold the soil condition as constant as it can be, and run the trial method for a defined period against current practice. Count labour minutes per vehicle, water and energy use taken from meter readings, consumables issued, and how many vehicles needed a second pass. Then convert the trial into a per-vehicle cost and compare it with the baseline. Keep the site conditions in the trial — same bay, same crew, same shift pattern — so the result predicts the real workload.
Where a facility's needs fall outside the published models, PowerDe lists customized steam cleaning equipment as an engineering service. That is the route to take when the fleet mix, the bay layout or the runoff rules do not match a catalogue configuration.
The number the model should produce
A defensible evaluation ends with a cost per vehicle and a cost per square metre of panel for each method, both built from the same workload assumptions and both including rework and containment. That form of the answer stands up to a challenge from finance, and it lets a facility manager say which method is cheaper for this fleet rather than for fleets in general.
