An auto-detailing workspace is not a single bay with a drain. It is a set of small areas, each with a finish that reacts differently to the same mess. Polish overspray sits on a masking sheet, dressing residue on a handover sill, water spots on a cured panel, and grease tracked in from the waiting lane. Accessories are what carry a heat-based machine to those spots, so the accessory list is the part of a quotation that most often gets skimmed and most often causes rework.
Start from reach and handling, not from nozzle names
In a detailing workshop, most surfaces are not directly in front of the operator. A door jamb, a sump well, the underside of a spoiler, a roof rail and a boot lip all sit behind or above the machine. Before agreeing to any nozzle, fix three lengths in writing: the hose, the wand or lance, and the power cable. Walk the route you would actually take around a vehicle in your own bay. Watch for a kerb, a wheel stop or a drainage channel in the path of the hose. A machine that cannot reach the far side of a car without being dragged across the paint is not an attachment problem. It is a layout problem, and it should be caught before the order.
Match each attachment to a deposit you can name
Write down the deposits your shop deals with, then ask which attachment is meant to handle each one. A detailing shop deals with loose dust in a vent grille, and with wax and sealant film on an exterior panel. It also sees oily dressing on a tyre sidewall, dried drink spill on a carpet edge, and grease carried in at the entrance. Ask the supplier to state, for every item they include, what the item is for and on which surface it is intended to be used. A list of part numbers tells you nothing. A list of functions lets you compare two quotations on the same terms.
This matters because the mobile heat-based units in the catalogue work in more than one mode. The driving style steam cleaner is listed with dry-steam, wet-steam and hot-water modes, for indoor garages and narrow outdoor parking spaces, and it is catalogued both with and without a battery. Two of those facts change the attachment question. The mode you choose for a finish determines the head you need. And a variant supplied without a battery puts the run of the cable and the position of the supply point into the layout conversation.
Protect the finishes that detailing work is paid to preserve
A customer pays a detailing shop to leave paint, trim, leather and coatings in better condition than they arrived. Any tool that applies heat and pressure close to those surfaces needs a written answer on control. Ask which items limit where the flow goes, how a delicate surface is approached, and what the operator does when a surface must be kept dry. Open paint, freshly applied coatings and areas under a curing lamp are excluded from heat work. That exclusion belongs in the work instruction, not in a conversation on the day.
For interior work, also ask what happens to the moisture. Upholstery, headliners and carpet need to dry inside a working day, otherwise a clean interior turns into a damp one. The items that matter here are not only the ones that apply the flow, but the ones that manage what comes off the surface and what is left wet. Catalogue pages differ on whether an extra vacuum row appears in the specification. Read the page for the exact model and variant you intend to buy, and do not assume a capability shown on one entry carries across the range.
Contain the run-off, or the cleaning only moves the mess elsewhere
Detailing work generates run-off that carries dressing, wax, polish dust and road film. Ask where that water is expected to go. In a bay with a drain, the question is whether the flow is allowed to reach it and what is captured beforehand. In a bay without one, the question is what holds the water in a defined area. The same applies to the waiting lane and handover area, which are cleaned last and must stay presentable while other work is still running.
Turn the list into a written specification, then test it
Before signing anything, send the same written question list to each bidder and ask for the answers in the quotation: the exact model and variant being offered, the attachment and nozzle list with the function of each item, hose and wand lengths, what is included versus what your shop provides, and the water inlet arrangement. Then run one machine on your own worst surfaces, on one vehicle of each type you work on. Record four things: whether the head reached the area, what the deposit did, how long the surface stayed wet, and how much refilling cost in operator time.
Where the standard accessory set does not fit your bays or your mix of vehicles, treat that as a configuration question, not a shopping question. Raise it at enquiry stage. Customized steam cleaning equipment is described as the route for site-specific requirements, and PowerDe cleaning equipment covers the mobile and fixed units listed for vehicle, garage and parking environments. Ask for figures in writing for anything your own trial cannot measure, and keep the trial sheet with the purchase file.
