Yacht exteriors are not one surface. A hull below the waterline, a gelcoat topside, non-skid deck, brightwork, canvas and an outdrive each collect different soil, and each reacts differently to heat, pressure and detergent. That is why a cleaning team needs a written plan rather than a crew reacting to whatever they see when the boat comes in.
The practical question for an operator is not "which machine do we buy" but "how do we sequence the work so the job finishes in the promised window, without damaging the finish". This article sets out how we plan those jobs, and which equipment decisions actually move the result.
Start with a survey, not a price
Before a crew touches the boat, someone walks the vessel and records what is on it. On a hull that has been in the water for a season the soil is biological: algae, barnacle growth, slime. On a boat that has been on a mooring the soil is mostly atmospheric — dust, pollen, industrial fallout, and run-off streaks along the transom. Engine compartments bring oil and grease, which behaves nothing like marine growth.
That single distinction changes the method. Biological growth needs dwell time and heat to release from the gelcoat. Grease needs thermal energy to drop off the metal. A crew that treats both with the same pressure setting either spends the whole day on one panel or leaves staining behind.
Write the survey down on a job sheet, panel by panel: hull, waterline stripe, topsides, deck and non-skid, cabin top, windows and portholes, swim platform, transom, engine bay, and through-hardware. For each, note the finish, the soil type and whether the surface is accessible from the dock or requires the boat to be lifted.
Split the job into zones and set the order of work
Cleaning from top to bottom is not a preference, it is physics. Dirty water runs down. If a team washes the hull first and then cleans the superstructure, the hull gets re-contaminated and the work has to be repeated.
A typical sequence for afloat work runs: superstructure and cabin top, topsides and gelcoat, windows and stainless, deck and non-skid, hull and waterline, and the engine compartment last because it is the messiest task and it should never be done above clean surfaces.
Then set a realistic rate per zone against crew size. If the plan says the topsides take two hours with two people, and the crew has only one person available that day, the plan needs to change before the job, not during it. A schedule that assumes the ideal crew is a schedule that will be missed.
Match the equipment to the site conditions
Site constraints decide the machine more often than the soil does. On a berth with no shore power, a corded machine cannot be used at all. In an indoor shed with limited drainage, the volume of rinse water becomes the limiting factor. On a pontoon, the operator needs to move the unit by hand in tight quarters.
For jobs where mains power is available and the work is fixed in one place, a high-pressure steam cleaning machine such as the PowerDe HW02 is a strong fit. Its published specifications — 6 kW heating power, 160 °C steam temperature, 0.8 MPa vapour pressure and an 80 L stainless tank on a 220 V supply — mean the operator gets heat and pressure together, which is what releases greasy and biological soil without aggressive scrubbing. Where power is not available, or the crew has to travel along a long pontoon or into a narrow yard, a battery-powered hand-pushed or driving-style unit keeps the team moving instead of chasing extension leads.
Heat also matters for the parts of the job owners complain about: the waterline stripe, the non-skid tread where grime locks into the pattern, and the engine bay. Steam carries energy into the texture of the surface, so the soil releases with less mechanical force. Less force is what protects gelcoat, decals and seals.
Low water volume is a site-access issue, not just an environment claim
Marinas are increasingly strict about what may enter the water. Rinsing a hull with a hose sends wash-water straight over the side. A steam or low-flow system uses a fraction of the water, which means far less run-off to manage and far less chance of being told to stop mid-job.
Plan for containment anyway. Assign one crew member to hold and move collection sheeting, and record where the wash-water goes for each zone. On hard standings this is straightforward; alongside a pontoon it takes preparation, and it must appear in the job plan with named responsibility rather than being left to the crew to improvise.
Put the consumables and access checks in the plan too
Most overruns in this trade are not caused by the cleaning method. They are caused by a missing part: the wrong nozzle, a flat tyre on the trolley, no spare hose, no freshwater connection at that berth, or shrink-wrap that was never scheduled and now has to be built around the crew.
The plan should therefore carry a short pre-job list alongside the cleaning sequence: power source at the berth, water supply, drainage or collection route, lift or cradle arrangements if the boat comes out, drying time before shrink-wrap, and the accessories the crew will need for that specific hull shape. It should also state what is not included, because scope drift in yacht work is usually silent — a crew assumes the engine bay is in scope, the owner assumes it is not.
Review the job against the plan, not against how it felt
After the boat leaves, compare actual hours per zone with the planned hours. If the deck consistently takes longer than the topsides, the rate is wrong, the method is wrong, or the deck needs different equipment. Fixing that one number on the next job sheet improves margin without asking the crew to work faster.
Teams that plan this way tend to end up standardising on a small number of machines that suit their berths and boat mix, and then specifying them properly rather than buying the most powerful unit available. If you are building a programme for a marina, a detailing business or your own in-house crew, talk to our team about the site conditions and we will help you size the equipment to the job.
