A buyer preparing to buy steam cleaning equipment for yacht exterior surfaces has two jobs at once. The first is describing the boat so that a supplier can picture the work without seeing it. The second is writing down the conditions at their own berth, quay or yard, because the same hull cleaned in a tidal marina and in a covered hard-standing area presents two different problems to the same machine.
Start with the surface list, not the product list
Ask what the cleaning has to act on. On a yacht exterior that is rarely one material. Gelcoat topsides and the underwater hull behave differently from non-skid deck covering, and both behave differently from an anodised or painted superstructure on a metal vessel. Write one line per surface: what it is, where it sits, how dirty it gets, and how often it is cleaned. A single line that says "the deck" is where most misunderstandings begin, because a teak-laid deck, a moulded non-skid deck and a painted deck are three different briefs.
Keep the list to the outside of the vessel. Deck hardware, stanchions, cleats, through-deck fittings, portlights, rub rails, transducer and anode mountings, and the shut lines where deck meets hull each need their own row, because the sensible treatment of a bare stainless fitting is not the treatment of the laminate around it.
Describe the deposits, because they decide the duty
A supplier cannot size equipment from the word dirty. Name what is on the surface. Above the waterline the usual candidates are traffic film from harbours and roads, exhaust staining near the transom, bird contamination on vertical topsides, salt and spray residue, and organic growth on shaded decks and in slow-draining cockpits. Below the waterline it is slime, weed, barnacle settlement, and the hard crust that forms on a hull left in the water through a full season. On a vessel kept afloat year round the growth layer is the duty; on a trailered boat it is mostly traffic film and deck grime. Those two cases point to very different equipment.
Say how long the deposit has been there and whether the surface has been cleaned before. A hull lifted at the end of every season is a different job from one lifted after several years, and a supplier who is not told this will price the easy case.
Write the exclusions before anything else
This is the section that protects you. For every surface or fitting that must not be cleaned, or must not be cleaned in a particular way, list it and state what happens instead. On most vessels that list includes antifouling coating on the underwater hull, any area where the gelcoat is blistered, crazed or lifting, repaired or patched laminate, decorative vinyl and decals, boot topping, wooden trim and varnished spars, anodes, and the friction surfaces of working deck gear. Antifouling is a controlled coating, and where laminate is failed or delaminating the first step is a survey rather than a cleaning method.
Leave the exclusion column blank and the job will be quoted as though the whole vessel is one uniform surface. Fill it in and quotations from different suppliers become comparable.
Put the site conditions in writing
Work afloat and berth-side is governed by the location, not by the brochure. Record whether the work happens on a pontoon, a quay, a slipway or inside a covered hard-standing area, and whether the surface the operator stands on is tidal, wet or sloped. State the distance to the nearest water connection, whether the supply on site is potable, and whether it is hard, since both salt exposure and hard water affect the equipment as well as the hull. Note how far the machine has to travel around the vessel and whether a mobile unit can actually be moved the full length of the boat on the surface available; berths commonly have steps, hose restraints and services shared with a neighbour.
Power belongs in the same section. State what is available at the position, from the shore-power outlet on a pontoon to a generator or an inverter fed from the vessel's bank, and whether any part of the work has to run untethered around the far side of a long hull. A machine that suits a yard with a service pillar may not suit a swinging pontoon with one outlet.
Make run-off and containment part of the method
Whatever comes off the hull and deck ends up somewhere. On a berth that means the water and the pontoon; on a slipway it means the yard drainage. Ask what the site and the local authority permit, and make the answer part of the written method: what may be discharged, where, and with what collection or containment. Steam and hot-water methods condense into comparatively small volumes of water, which is a genuine advantage in a marina, but a small volume of run-off from a fouled hull is still run-off. Give a vague answer here and you will receive vague pricing and a dispute later.
Set the trial terms in the brief, not on the day
In the brief, state what the trial must cover and what would stop it. A workable trial is a taped test area on each surface type in the list, worked at a stated sequence and pass rate, judged against a stated standard rather than an opinion. Ask for the working method in writing, including nozzle type, distance from the surface, number of passes, whether the lance is kept moving or held in one place, and what the operator does the moment a surface begins to lift. Decide before the trial what happens if a test area fails, and record the result so the same standard can be applied to the next boat of the same model.
Ask about the equipment in row labels, not in guesses
PowerDe presents its mobile steam cleaning machine range around indoor garages and narrow outdoor parking spaces, and its Fixed Steam Cleaning Machine PowerDe HW02 around vehicle exterior cleaning at fuelling and parking sites, interior work and engine compartments. Marine work is not written on those pages as an application. That is exactly why the brief should carry your site conditions and then ask the supplier to confirm, for the exact unit being quoted, the rows that matter beside a berth: the working-voltage requirement, how the machine is fed water and from what source, how the tank and heating arrangements limit a continuous session, the machine footprint and how it is moved on the surface you have, and which protection functions are fitted and under what conditions they interrupt a job. Do not accept an answer that carries figures from one model onto another; keep each number attached to the unit named in the quotation, and read a tank figure as a capacity rather than as working time.
Name the commercial and service questions
Close the brief with what a purchase file needs. If the standard listing does not suit the berth, ask what customized steam cleaning equipment arrangement is being offered and what it changes in scope and price. Ask which parts wear and how quickly, what service cover exists in your area, and how a fault is handled when the vessel has a sailing date. Ask for lead time, the delivery point, and who connects the machine to water and power there. Each of these is one short paragraph in the brief; each one left out becomes an assumption made by somebody else.
What the finished brief should fit on
A usable brief is short enough to be read. One page of surfaces and deposits, one page of exclusions with the fallback for each, one page of site conditions covering position, power, water, movement and run-off, one page of trial terms with the stop conditions, and one page of unanswered equipment rows for the supplier to complete and return. Send that same document to every supplier you approach; comparing one-off enquiries mostly compares wording rather than capability.
Where the surface list, the exclusions and the berth conditions are already answered, a supplier who can genuinely support yacht exterior work will answer with a method and a trial. Where the reply is only a model name and a price, that is also an answer, and it costs one email rather than a damaged topsides job.
