Ask a maintenance team what cleaning costs and most answers point at one line item: the water bill or the detergent purchase. That is usually the smallest part of the bill. The larger share is the time your technicians spend scrubbing, the production hours you lose while a machine sits with the guards open, and the compliance paperwork you file after something goes wrong. A defensible cost evaluation adds all of it together, then compares cleaning methods on the same basis.
This guide walks through a method a plant or facility team can run with data you already have. It ends with the specific questions to ask a supplier, so the numbers in your comparison are not marketing copy.
Start with what an hour of cleaning really costs
Write down one representative cleaning task — the engine bay of one service vehicle, the exterior of one bus, the hood and filters of one commercial kitchen line, the housing and guides of one machine tool. Do not start with the whole site; a single task gives you a clean before-and-after.
For that task, record four inputs over several working days:
- Labour minutes, from the moment the technician picks up the tool to the moment they put it down and log the job complete. Include the walking, the rinsing, the waiting for a surface to drain, and the re-closing of guards.
- Utility input, read from the meter or the water inlet where possible: litres of water and, for electric machines, the electrical energy the task consumes.
- Consumables actually used: detergent litres, brushes, cloths, and any disposal of the wash water if your site treats it as contaminated effluent.
- Access downtime — the minutes the asset was unavailable to the next job. On a shared bay or a production line, this is often the dominant cost.
Multiply labour minutes by a fully loaded technician rate, not the base wage. A fully loaded rate carries supervision, insurance, training and idle time, and it is the number your finance team will accept.
Add the costs that never appear on an invoice
Three categories are routinely left out of cleaning cost models, and each can outweigh the consumables line:
- Quality failures. A surface cleaned but not actually degreased means a repeat visit, or a downstream defect. Count re-work rate, not just first-pass completion.
- Water and effluent handling. Sites on metered supply or with discharge limits pay for water twice — once at the tap and once at the drain. High-volume hose washing can also require collection and treatment.
- Risk and record-keeping. Grease build-up in a kitchen extract system or around machinery is a fire and slip exposure. The time spent documenting cleaning to an auditor or an insurance inspector is a real labour cost.
Once these are in the model, the comparison shifts. A method that uses very little water and no chemical detergent, and that shortens the task, can justify a higher equipment price even if the consumables line was never the problem.
Compare cleaning methods on cost per completed task
Normalize everything to one unit: cost per task completed to the standard you require. Then place the methods side by side:
- Cold-water pressure washing: low equipment cost, high water volume, detergent needed for grease, long drying and run-off.
- Manual scrubbing with detergent: high labour minutes, moderate consumables, inconsistent results between shifts.
- High-temperature steam: low water volume per task, no chemical detergent for many grease and residue tasks, higher capital cost per machine. Our PowerDe cleaning equipment series covers this in fixed, hand-pushed and mobile configurations, so the machine matches where the work is done.
Steam is not a universal answer. Thick, loose dry debris and large flat areas washed on a schedule can still be cheaper with a conventional method. Put both numbers on the same page for the same task and let the task decide.
For heavy grease and oil residues on machinery, industrial steam cleaning equipment is worth testing because the heat does the work that a detergent and a brush would otherwise do, and the low water volume means the asset can go back into service sooner.
Price the capital against the labour you remove
Equipment cost should be amortised over the tasks it performs, not judged as a sticker price. Take the machine price plus expected service, divide by the number of tasks it completes over its working life, and add that figure per task to the labour, utility and consumable lines.
A fixed installation makes sense where the same task repeats at one location. The Fixed Steam Cleaning Machine PowerDe HW02 is a 220 V unit with 6 kW heating power, a published steam temperature of 160° and vapour pressure of 0.8 MPa, an 80 L SUS304 tank, and switchable dry and wet steam with a vacuum function — specified for vehicle exterior cleaning at service stations and parking areas, interior work, and engine-compartment cleaning. Those published figures let you estimate energy per task directly from the heater rating and the working minutes.
Where the work moves between vehicles or between bays, a mobile unit changes the labour side of the equation, because the technician stops walking hoses across the site. Compare the driving-style and hand-pushed models in the same series on the same task sheet before choosing.
Build the evaluation on numbers you can verify
Before you sign a purchase, ask any supplier — including us — for three things in writing:
- Published technical parameters for the exact model, not a brochure average: heating power, steam temperature, working pressure, tank capacity, power supply, and machine dimensions.
- A trial on your own surface or asset, timed by your own staff, with the water and energy use recorded.
- A clear statement of what the machine is specified for. If a supplier will not confirm the application, treat the claim as unproven.
Where your requirement is not a standard configuration, tell the supplier what the surface, residue and access constraint actually are. Customized steam cleaning equipment is usually specified from the residue type and the access condition, not from a catalogue model number.
Run the trial before you commit
A cost evaluation is only as good as its measurement window. Pick one task, measure the baseline honestly with a stopwatch and a meter, run the alternative method on the same task under the same conditions, and compare cost per completed task including downtime. That single comparison, done properly, settles most of the argument — and it protects you from buying an equipment specification that was never meant for your surface.
