What makes a parking area tight for cleaning work
A parking area that is tight for cleaning is not simply a small area. It is an area where the machine has to share space with parked vehicles that cannot be moved on schedule. In a shopping-centre deck or an airport car park, the bay you are working beside will be occupied tomorrow morning whether you like it or not, so the work has to be done around it, in the gaps that exist, without lifting a car or blocking a lane.
The constraints repeat across site types. Indoor decks bring low beams, columns, cable trays and a floor finish that stays wet. Outdoor decks bring kerbs, wheel stops, expansion joints, gratings and wind. Surface lots bring loose grit, kerb-side dirt, and the fact that the vehicle on the left and the vehicle on the right are not moving. Each of these changes the pass you can make, and each one has to be written down on the surface list before anyone talks about a machine.
How the HMW2 is positioned on the site
The PowerDe HMW2 steam cleaner page describes a driving-style mobile active-water machine offering dry steam, wet steam and hot water, and says it is used mainly in indoor garages and in the narrow spaces of outdoor parking lots. The same page presents it as a driving-style mobile device that runs on a self-equipped battery, that can be stopped and driven at any time, and that uses a PTC semiconductor heater.
The without-battery listing carries the same mode range and the same positioning for cramped garage and parking spaces, and its page also names protection against high voltage and short circuit, high temperature, leakage and running dry. Because the two versions are sold as different configurations, the documentation that comes with each one is different, and any claim about power, charging or run time has to be read against the version actually quoted. Elsewhere in the same range, the PowerDe cleaning equipment series covers fixed, hand-pushed and driving-style machines, so a tight-parking brief should be matched against the series, not assumed from one datasheet.
Moving the machine between parked cars
The published rows for the HMW2 with battery give machine dimensions of L1275 mm by W570 mm by H1185 mm, with the remark that it is an automatic-movement machine, and give the mode of movement as autonomous driving. Those rows are what the page states for that machine. They are a starting point for a site check, not a promise about your deck: the numbers say nothing about turning into a specific bay, and they do not include an operator, a hose, or a cable in the aisle.
The practical test on site is smaller than the datasheet. Walk the aisle with the machine, or with a template of its outline, and check whether it can pass between two parked cars with a door open, whether it clears a wheel stop without the frame touching it, whether its height fits under the beam at the far end of the level, and whether it can be driven onto the lift or ramp used to move it between floors. A machine that fits on paper but cannot be turned at the end of the run will lose the run.
Power without a cable run
A battery-fed machine changes the route rather than removing the problem. The HMW2 with-battery page records the working voltage as a 48V mobile battery, and states that the battery is customer provided. That single row carries two decisions. The machine does not need a socket at the bay, so an operator can work in the middle of a long row of cars without a trailing cable across a driving lane. But the pack, its capacity, its charger, its place in the store room and the swap routine are all site items, because the machine's own page does not publish capacity or run time.
Ask, in writing, for the run time behind the working-supply row for the exact pack you intend to buy, and for the charge time and the charge point that goes with it. In an indoor deck the charge point is a place problem before it is an electrical one: somewhere dry, ventilated, away from the customer route, and within reach when the pack is flat before the shift ends. On the variant sold without a battery, the supplier literature is silent about charging behaviour, because that behaviour belongs to whatever pack the site fits itself.
Water supply in a car park, not in a wash bay
Most parking areas do not have a wash-bay inlet. The water is a hose bib in a plant room, a service tap behind a barrier, or the nearest drain the site will allow you to use. The HMW2 page records tap-water inflow through a 4-point internal-tooth fitting and a 60L clean-water tank listed under box volume. The tank travels with the machine, so the question becomes how far the operator has to go between the tap and the cars.
Two rules settle this quickly. First, a tank volume is a carried volume, not a working time; how long it lasts depends on the mode in use and on the operator, and neither figure is published for this machine. Second, the inlet fitting has to match the tap that actually exists. Before ordering, photograph the tap and the connector, write down the thread, and confirm the fitting on the quotation matches it. A machine that arrives with the wrong inlet cannot be refilled on a deck, and an adapter found on the day adds a leak point.
Dry steam, wet steam and hot water as amounts of water
The three published modes are not three strengths; they are three different amounts of water. Dry steam carries the least liquid into the job, which matters on a deck where the floor cannot be flooded and where standing water is a slip claim. Wet steam and hot water carry more, lift more, and leave more run-off. On a tight-parking site the choice is therefore made by the room, not by the dirt alone.
Decide per area which mode the site can accept, where the run-off goes, and whether the surface will be dry again before the cars return. A deck that reopens to traffic in a few hours is a low-water job by definition. If the run-off has nowhere to go, the mode has to change, the area has to be smaller, or the work has to move to a level that has a drain. Note also that a temperature stated at the generator is not a temperature delivered at the nozzle; the HMW2 pages do not publish a steam temperature, so it should be asked for rather than assumed.
What can and cannot be cleaned between the cars
In tight parking the surfaces have to be listed as they are, not as in a wash bay. Vehicle exterior panels, sills and wheel arches that can be reached without opening a door, the kerb line and the bay markings, the plinth and the kerb face, the apron at a ramp, the top of a wheel stop, a kerbside gutter: all are realistic. The inside of an engine bay, the far side of a car parked hard against its neighbour, and any panel above a sealed electrical housing are not, unless the site can move the vehicle.
Write an exclusion column into the standard and name the fallback for each row: a hand-wash for the panel that cannot be reached, a different method for a painted or repaired surface, a deferral for anything whose coating history is unknown. Where the brief needs a different configuration entirely, the customized steam cleaning equipment route is where that conversation starts.
Protecting the cars that stay parked
The safety design named on the HMW2 pages covers the machine itself: high-voltage and short-circuit protection, protection against high temperature and against leakage, running-dry protection and, on the with-battery listing, high-voltage explosion-proof. Read those as the machine's own protection features for that configuration, listed as items rather than as a count, and ask the supplier which of them are present on the exact version quoted.
The third-party risk is a different matter and belongs to the method, not to the machine's protection list. Paint that has been repaired, re-coated or left uncured, decals and vinyl trim, badges, printed markings, lamp lenses, rubber seals, waxed or oiled surfaces and any bonded joint should be held outside a heated pass until the site confirms their condition. Mark these exclusions on the bay map before the trial, not after a claim.
Running the job in a live car park
A live site runs on shift patterns, not on ideal conditions. Set the working window against the times when the bays are empty, plan a route that never blocks a driving lane, keep the machine and its hose off the customer path between passes, and decide where the machine is parked when an operator walks for water or a fresh pack. Time the job as a block: set-up and isolation, shielding, the cleaning pass, the dry and recheck, and restore and hand-back. Use the second run of the same bay as the timing basis, because the first run always discovers something.
A small bounded trial answers most of the rest. Tape off one row of bays, photograph the surfaces as they stand, write the stop conditions down before any steam is applied, run the job once, then run it again and inspect the next day, when traffic has crossed the floor. That is the only cycle-time figure worth quoting back to the client, and it is a figure from their site rather than from a datasheet.
What to confirm in writing before ordering
Ask for the rows the site's own conditions depend on, for the exact unit being quoted: steam temperature and pressure as delivered at the nozzle; the run time and capacity of the pack, with the charger matched to it; the bare weight of the unit, the length of hose and wand supplied, what accessories are in the box, how much water the machine uses per hour, its noise level, and which protective features are fitted on that version. For the version sold without a battery, ask what those same rows become once a battery is fitted locally. Where the parking layout needs something other than a standard machine, the same list becomes the enquiry brief.
Tight parking is won by matching a machine to a layout that has already been surveyed. The HMW2 pages place the machine in indoor garages and in cramped outdoor parking spaces, and the trial described above is what proves that positioning against your aisles, your water point and your reopening time. Confirm the rows, run the row of bays, and write the result into a one-page standard for that layout with a date to review it.
