A fixed steam machine plumbed into a wash bay is one kind of purchase. A mobile steam cleaning machine that travels between bays, the forecourt and customer parking is another kind of purchase entirely: it has to pass through gates, carry or find its water, work without a fixed plumbing run, and still produce a finish you can hand the keys over on. If you run a car-wash or detailing business and are comparing mobile units, the sensible order of work is to define the job first, measure the site second, and read the specification sheet last.
1. Define the soil before you look at machines
Most car-wash demand falls into three groups, and each one points at a different cleaning method:
- Dried road film and salt on exterior panels, sills and wheel arches — a water-soluble film that responds best to hot water and a rinse.
- Interior soil — tracked-in sand, drink spills and seat grime. Here low-moisture cleaning matters, because a soaked interior takes hours to dry before the customer returns.
- Engine-bay oil film — light, fresh oil deposits respond well to heat; thick, aged sludge usually needs mechanical removal first, whatever machine you buy.
Now match those jobs to machine modes. The PowerDe PWD02 steam cleaner page, for example, lists hot-water, dry-steam and wet-steam modes together with a high-pressure water gun, a waste-water tank and a vacuum cleaner — a combination that covers the exterior wash, a low-moisture interior pass and the engine bay from one machine. If your business only sells quick exterior washes, you may not need all three modes. If you sell detailing packages, a single-mode machine will quietly force you to buy a second process later.
2. Measure your gates and aisles before you read performance claims
A machine that fits the bay but cannot pass the gate is the wrong machine. Before shortlisting, walk the site with a tape measure: gate widths, the tightest aisle between parked cars, turning space at the end of the bay, and any ramp and its slope. The published footprint then tells you what fits. The PWD02 listing gives 1275 × 570 × 1185 mm, a width that gets through a normal single-vehicle gate; the PowerDe PWD01 steam cleaner listing gives 2500 × 900 × 1050 mm — a noticeably longer machine that needs more turning room. PowerDe's product pages position these driving-style units for indoor garages and narrow outdoor parking areas, which is exactly the situation where a tape measure settles the question faster than any brochure.
3. Decide who supplies the battery
PowerDe lists several mobile models in two versions — with battery and without battery. The listings describe the same machine, so the real question is how the power chain gets completed on your site. The PWD02 specification shows a working-voltage line of 220 V (455 V mobile battery) with a note that the battery is replaceable, but it does not publish battery capacity, run time per charge or charger output. Before ordering, ask the supplier in writing:
- How many cars can one charge realistically cover, and what is the run time per charge?
- Is the charger included, what is its output, and where will it sit — with power and ventilation?
- Can the battery be swapped mid-shift, and what does a spare cost?
- What is the battery warranty, and how should the pack be stored if the machine sits idle between shifts or in winter?
If your site already runs equipment on a 48 V battery chain, say so when you enquire: the PWD01 listings state that the battery is customer-supplied, and reusing an existing battery standard changes both the price and your spares planning.
4. Plan water refill and drainage around the machine, not on paper
A mobile machine carries its own water, and that sets your working radius. The PWD02 page lists a 60 L clean-water tank with a 4-point internal-thread tap fitting; the PWD01 listing gives an 80 L tank. From your normal starting position, measure how far an operator must walk to the nearest tap and back, and check that the fitting matches your hose before the machine arrives. Then look at where the dirty water goes. The PWD02 carries a waste-water tank, but if your process discharges into the yard, the drainage route and any oil-separator requirement are set by your local authority, not by the machine. Confirm those rules before the first wash runs, not after an inspector asks.
5. Read the specification for what it does not say
Two gaps matter more than anything printed on the sheet. First, steam temperature and pressure are not published on the PWD02 page — if a competitor quotes figures and this listing does not, ask for the numbers in writing so you are comparing like with like. Second, the built-in protections named on the listings — leakage, short-circuit, high-temperature, high-voltage and water-shortage protection — protect the machine, not the person holding the lance. A steam lance still needs gloves, eye protection, a firm rule about never pointing the nozzle at a colleague, and a short training session before anyone works unsupervised.
6. Trial it on your own dirt, for one full day
Before you order, run the machine on your site for a full day with your own staff and your three dirtiest cars. Write the acceptance standard down first — what a finished interior or engine bay looks like, and how long drying may take before you hand keys back. Then time every stage: setup, wash per car, refill walks, the interior pass, and drying. A machine that saves labour during the wash but adds refill trips and drying delays can easily lose on the numbers that matter to a car wash: cars per day and time to handover.
A short closing checklist
- Soil types defined, and the machine's modes matched to the work you actually sell.
- Gates, aisles and turning space measured against the published footprint.
- Battery chain settled in writing: capacity, run time, charger, swap policy, warranty.
- Refill radius, fittings and drainage route confirmed, including local discharge rules.
- Unpublished parameters requested in writing; operator training scheduled.
- One-day trial on your own vehicles against a written standard.
If you want the missing figures — battery run time, steam temperature and pressure, charger details — before you compare models, request them from PowerDe's team directly, and review the current mobile and driving-style models on the cleaning equipment pages.
