Ask a maintenance crew how long a degreasing job takes and you will get a number. Ask three different crews and you will get three numbers. The gap is not dishonesty; it is that cleaning time is not a single quantity. It is a set of small tasks, several of which are invisible on a timing sheet, and a buyer who can see those tasks can price the job, staff it and schedule it around production instead of discovering the cost after the purchase order is signed.
The estimate below is built from observation, not from averages. It works for factory machinery degreasing of any size, and it gives you a figure you can defend when the cleaning budget is reviewed.
Start by classifying the soil, not the machine
Two machines of identical size can differ by a factor of several in cleaning time because the deposit on them is different. Grease is not one substance. A bearing housing packed with consistency grease, a gearbox casing film of cutting fluid that has been baked by operating heat, a frame holding dried coolant sludge, and a surface coated in airborne oil mist from a stamping press all behave differently under heat and pressure.
Before any timing, write down for each machine: what the deposit is, how thick it is, how long it has been there, and whether it has been heated by the machine itself. Hot, polymerised oil that has been cooking on a surface for months is a harder job than fresh oil of the same thickness. This four-part description is the variable that explains why reference times from another plant never transfer cleanly.
Break the job into the four timed stages
A degreasing cycle has four stages, and they scale differently.
Stage 1 — preparation. Isolating power, letting hot surfaces cool, laying protection over motors, sensors, terminal boxes, drives and control cabinets, and routing the machine to the wash position. This stage is fixed cost per machine. It does not shrink with a faster machine.
Stage 2 — loosening. Heat and dwell doing the work so that mechanical effort does not have to. Time here is set by the deposit you classified, not by the surface area.
Stage 3 — removal. The passes the operator makes with the lance, and any wiping or squeegee work. This stage scales with area and with how far the operator has to reach.
Stage 4 — verification and recovery. Inspection against a defined finish standard, re-check of the protected components, removal of protection, and clearing the wash area.
Most estimates are wrong because they time stage 3 and forget stages 1 and 4. Time each stage separately once, and you have a breakdown you can optimise.
Measure one clean, then extrapolate to your fleet
Do not estimate from the datasheet. Run one clean on one representative machine and record four numbers with a stopwatch: minutes to prepare, minutes of dwell per soiled zone, minutes of lance work per square metre of surface, and minutes to verify and recover. Then record the machine's soiled area in square metres.
Extrapolate by surface area within a soil class, never across soil classes. A machine with twice the soiled area of the same soil type will not take twice as long, because preparation and verification are largely fixed. A machine with the same area but a different soil type is a new job and needs its own trial.
Choose between the fixed bay and the mobile route, because that decision changes the number most
The largest single lever on total cleaning time is whether the machines come to the cleaning equipment or the cleaning equipment goes to the machines.
A fixed steam cleaning machine such as the PowerDe HW02 puts the process at one location. Its published parameters — 220 V working voltage, 6 kW heating power, an 80 L SUS304 tank, 160° steam temperature and 0.8 MPa vapour pressure, dry or wet steam selection and an integrated vacuum — describe a process that stays the same from job to job. Once a bay is set up, stage 1 shortens on every subsequent machine, dwell settings are already proven, and the recorded per-square-metre figure you measured the first week stays valid the following year. That consistency is the reason a fixed bay produces a defensible number, and why the first trial should be run at the bay you actually intend to use.
Where machines cannot be moved, or where the plant layout means a crew walks a long route between them, a mobile steam cleaning machine that travels to the equipment removes the transport and queuing time from the cycle. Mobile units in the PowerDe range are listed for tight indoor and outdoor spaces, and the trade-off runs the other way: every new location brings part of stage 1 back, because the crew has to position the machine, run the hose and re-protect nearby equipment. Measure the walking distance between your machines. If it dominates the cycle, the mobile route wins on total labour even if stage 3 is slower per machine.
Count the hidden minutes
These items are absent from most cleaning-time quotes, and each one is recoverable once it is visible:
- Production release. Cleaning cannot start when the shift ends if the machine must cool. Record the release-to-ready delay, not just the working minutes.
- Utility travel. How far the crew walks for water, power and drainage. A 220V steam cleaning machine with an 80 L tank and a tap-water inlet reduces refills, but only if the supply is near the bay. Confirm the supply point and the tank capacity against your machine count before you blame the equipment for a slow cycle.
- Setup drift. Two operators with the same machine will produce two cycle times unless dwell, nozzle distance and pass rate are written down. Log the settings that worked, so the time you estimated is the time you get.
- Rework. The most expensive hidden cost. A defined pass or fail finish standard — visible substrate, no residue film, no run-off staining — ends the argument at inspection instead of restarting the job.
- Run-off handling. Degreased oil and water have to be contained and disposed of under your local rules. Containment and clean-up belong inside the cycle time, not outside it.
- Machine downtime the cleaning creates. If a cleaned machine cannot restart until it is dry and its protected components are checked, that recovery window is part of the production impact and should be in the estimate.
Convert the estimate into a labour figure you can budget
Once the four stages are measured, express the result as crew-minutes per machine per cleaning frequency, and separately as crew-minutes per square metre within each soil class. The first figure budgets the job. The second lets you price a machine you have never cleaned before, which is what makes the estimate an asset rather than a one-off record.
Then run the comparison that matters for a purchasing decision: total crew-minutes per month at your current frequency against total crew-minutes at a shorter frequency. Heavy grease that is addressed before it builds into a hardened layer cleans faster than the same surface left one cycle longer. If the trial shows that, the case is not for more cleaning labour; it is for a shorter interval with a faster process.
What to send when you request a cleaning trial
A supplier can only produce a credible time estimate from the same information you need to classify the job. Send: photographs of the worst deposit on the worst machine; the soil description from stage one of this article; the soiled area and access conditions; whether machines can be brought to a fixed bay; and your utility situation — available supply voltage, water point and drainage at the wash location. For a fixed unit that means the footprint and the service points, and for a mobile unit, the route and distances the crew will cover.
Shenzhen PowerDe Automation Precision Equipment works from a written process requirement rather than a fixed catalogue configuration, and its cleaning range covers fixed units, hand-pushed units and driving-style mobile units. Describe the soil, the machine and the site, and ask for a trial at your own location with the cycle time recorded. If your application is not one already documented on the product page, ask for it to be agreed in writing as a defined scope, including duty cycle, hose and wand lengths, spares and service response. That is how an estimated cleaning time becomes an actual one.
