What should be included in a site assessment for cleaning commercial sink exteriors?

Walk the vehicles and write down what the cleaning staff touches, panel by panel. Painted bodywork, anodised trim, plastic wheel arches, chrome, decals and livery, aluminium wheels, and the interior touch surfaces all react differently to heat, pressure, and detergent. Steam is hot and it works fast; a decal edge that lifts under 160°C steam will not lift under cold pressure washing, so the temperature the machine actually delivers matters more than the temperature printed on its datasheet.

Record the construction of each surface in the assessment: what the coating is, whether the trim is glued or clipped, which panels have a wax or sealant layer, and which areas carry baked-on road film rather than loose dust. Baked-on film is what makes the difference between a rinse and a real clean, and heat is what releases it.

On a fleet vehicle steam cleaning machine the practical test is simple: set the machine to its rated steam temperature and pressure, treat one panel, and let the operator tell you what changed. The vehicle engine bay steam cleaner setting is the same one used for the engine compartment, where dried oil and dust form a film that water alone will not move.

Steam cleaning is often chosen for sites where water is scarce or where run-off has to be contained, so the assessment has to state the water situation in numbers rather than adjectives. Note the inlet source, whether the site has a tap connection or needs a tank, and the hardness of that supply. A machine fed from a mains tap on a hard-water site will scale internally; a machine fed from a tank at a depot with no plumbed supply will run dry if nobody checks the level. Both are site conditions, not equipment faults.

Check what the machine expects at the inlet. The 220V steam cleaning machine HW02 in the PowerDe cleaning range takes tap water through a 4-point internal-tooth joint and carries its own 80 L tank in SUS304 stainless steel. Write into the assessment whether your site's fitting matches that inlet, whether the tank is refilled by hand or by hose, and who owns that refill on each shift.

A fixed steam unit is a different installation problem from a mobile one. For a fixed machine, confirm the supply voltage, the available circuit, and the length of hose and wand needed to reach the far end of the vehicle without dragging the unit across the bay. A 6 kW heating load on a shared workshop circuit behaves very differently from the same load on a dedicated line, and the assessment should say which one you have.

For mobile work, measure the access route rather than assuming it. Indoor garages with low ceilings, narrow parking bays, and tight turning radii are exactly where the driving-style units are placed on the PowerDe product pages, because they move the machine to the vehicle instead of the vehicle to the machine. Note the floor gradient, the doorway heights, and whether the operator has to lift the unit over a kerb at any point in the working day.

The assessment should finish this section by stating the working radius: how far the operator walks from the machine on a typical vehicle, and how many repositionings that means per vehicle. That number is the single best predictor of whether your quoted wash time is real.

Hot water leaving a vehicle takes oil, detergent residue, and road film with it. Before the equipment is chosen, document where that run-off goes: a grated channel to an oil-water separator, a sealed bund in a wash bay, or nothing at all. The last answer rules out a lot of otherwise suitable sites and should be found out in the assessment rather than in a visit from an inspector.

Record the surface the wash happens on. Concrete with a fall to a drain behaves differently from asphalt, and an outdoor parking bay with no containment is a different problem from an indoor bay built for it. Where the site cannot contain run-off, the assessment should say whether the method changes to a low-moisture steam pass that stays on the panel.

Add a line for storage and handling: where the machine sits between jobs, how it is protected from frost, and how the tank is drained. A steam unit left full overnight in an unheated depot is a machine that will not start on Monday.

The assessment is not finished when the machine is specified. Specify the sequence. Pre-rinse or brush down loose grit before any heat touches the paint, work top to bottom, keep the steam pass moving instead of dwelling on one panel, and dry the trim and door shuts so the vehicle leaves clean. Skipping the pre-clean is the most common cause of the swirl marks that get blamed on the equipment.

Set the pass rules per area: which mode for bodywork, which for the engine compartment, and whether the same nozzle serves both. A machine that switches between dry and wet steam lets one operator cover both jobs; a machine that does not means two sets of kit and two sets of instructions on the same shift. That distinction belongs in the assessment, with the mode named for each area.

Steam at high pressure is a burn risk, and the assessment should say so plainly. List the personal protective equipment the operator wears, name the guard distances for painted and plastic panels, and state which surfaces must never be steamed at close range. Note the machine's own safety functions where the datasheet lists them, such as leakage, short-circuit, high-temperature, high-voltage and water-shortage protection on the PowerDe steam cleaning machines, and note who checks them and how often.

Add the training record. Every operator who touches the machine should have been shown the mode selection, the tank refill, the shutdown, and the emergency stop. A site assessment with no named trained operators is a document that will not hold up in an incident review.

Price the assessment in the same units you will use to justify it. For each candidate setup write down the labour time per vehicle, the water and power cost per vehicle, the consumables, and the service interval. A machine that halves water use but adds an hour of operator time per vehicle has not saved anything, and a machine that adds an extra hour of throughput may pay for itself even if it costs more.

Compare mobile and fixed setups on the same sheet. Mobile units move to the vehicle and suit sites where the parking is spread out; fixed units suit a defined bay with a plumbed supply and a dedicated circuit. The site assessment is what tells you which constraint applies at which depot.

With the surface inventory, water data, access measurements, drainage answer, method, safety record, and cost sheet complete, the specification writes itself. Match the machine to the constraint that binds: steam temperature and pressure for the baked-on film you found, inlet and tank capacity for the water situation, mobility for the access route, and the mode set for the sequence you documented.

If your fleet includes different vehicle types across depots, expect more than one answer. The cleaning range on the PowerDe cleaning equipment pages covers driving-style mobile units for garages and tight parking, hand-pushed units, and fixed units for a defined bay. Send the same site assessment form to every depot before asking for a quotation, and the differences between sites will show up as specification differences rather than as arguments.

• Surface inventory: coating, trim type, decals, baked-on film locations.
• Water: source, hardness, inlet fitting, tank capacity, who refills it.
• Power: available voltage and circuit, heating load, cable length.
• Access: ceiling heights, bay widths, gradients, kerbs, working radius.
• Drainage: containment, separator, surface type, permitted run-off.
• Method: sequence, modes per area, nozzle set, drying step.
• Safety and training: PPE, guard distances, named operators, check routine.
• Cost: labour per vehicle, water and power per vehicle, service interval.

Do I need a site assessment for one wash bay?

Yes. The assessment exists to prevent the machine being blamed for site conditions. A bay with a hard-water supply, a shared circuit, and no containment will produce complaints whatever equipment you install.

What is the single most important measurement?

The temperature and pressure actually reaching the panel, together with the type of soil on that panel. That pair determines whether a steam pass releases the deposit or only moves it around.

Should the assessment be repeated?

Repeat it when the fleet, the livery, the depot, or the drainage rules change. A form written three years ago will describe a site you no longer have.