A marina or service yard rarely cleans a hull because the cleaning team woke up wanting to wash something. Cleaning happens between paid work cycles: between charters, before a survey, after haul-out, before the next job can start. That is why the question is not only which method removes the growth or the stain, but how the work is organized so that it finishes inside the window, does not delay the next booking, and can be repeated by a second crew member on a different boat. The notes below are a planning method for operators, written from the surfaces and the constraints of a working yard.
Start from the boat, not from the machine
Before anyone chooses equipment, write a surface list for the type of vessel you service most often. On a typical hull this separates into: above-water topsides (gelcoat, paint, non-skid deck, toe rail), below-water surfaces (antifouling coating, waterline band), through-hulls and fittings, seacocks and intakes, propeller shafts and rudders, anchor lockers and chain, canvas and sprayhood, stanchions and rigging hardware, deck hardware, windows and portlights, and the transom and swim platform area. For each item record the material, whether the surface drains, and whether there is an opening under it. Add fixed-angle photographs so that the next crew can compare like with like.
This list does two jobs. It turns one vague task, "clean the yacht", into a set of repeatable tasks with owners, and it exposes the places where water and heat are not wanted. Yards that keep this list current usually keep it next to the cleaning equipment series they use, so the surface group and the machine that serves it stay paired on the same sheet.
Split the work into windows the yard can actually release
Between work cycles, time is the hard constraint. Group the surface list by how much interruption each task needs:
Short window, boat still in the water or on the berth: topsides, deck, hardware, windows, canvas. This is the work that has to be finished and dry before the owner boards.
Medium window, boat on the hard with the yard's support: waterline band, below-water rinse and growth removal, through-hulls, shaft and propeller cleaning, anchor locker.
Long window, boat scheduled out of service: full hull preparation before recoating, keel area, and anything that must be left drying overnight.
Assign each group to a window and put the person in charge against it. A cleaning task with no named owner and no clock will be the last thing done before handover, which is exactly when quality drops.
Fix the no-spray list in writing, with the responsible person signing it
Heat and pressure should never cross a boundary that nobody agreed to. Before any wet work, the yard or the boat's representative signs a list of parts that must not be sprayed: seacocks and their spindles, through-hull fittings and their bedding edges, shaft log and cutless bearing area, rudder stock, mast step and deck fastenings, any penetrations where sealant is old, electronics and antennae, wind and pitot instruments, navigation lights, solar panels, deck speakers, engines and electrical panels in the cockpit locker, and laminated or serviced windows with suspect seals. Canvas, sprayhood, spray shield and non-skid are separate decisions, not part of the default.
Treat anything you cannot judge as dry-clean only for the first pass. A cleaning method that is uncertain on a joint is not a cleaning problem, it is a survey question, and it should be raised with the boat's representative before the window is sold.
Choose dry, wet and hot-water work by the soil, not by habit
Salt crust, loose silt and dust come off before heat is applied; driving a deposit in with hot water makes the rework worse. Organized marine growth on a hull is a different soil from a waterline stain band, and a stained gelcoat surface behaves differently again. Where the deposit is fresh, mechanical removal and rinsing are often enough. Where the deposit is baked or polymerised, heat has a job to do, but only after the loose material has been taken off.
Some yards keep the wash bay on a hot water and steam cleaning machine, where the product page describes dry-steam, wet-steam and hot-water modes and a mobile unit for tight access areas, because the bay layout gives you water, power, drainage and a safe walking surface. The mode decision still belongs on your own surface, tested on your own dirt.
Freeze four parameters so the result does not depend on who holds the lance
For each surface group, record and then hold constant: the mode used, nozzle or lance distance, travel speed, and dwell time, plus how loosened material is recovered. Write these on a single page that travels with the work order. Two operators following one page on two similar hulls should produce comparable results; two operators improvising will not, and you will spend the difference in rework and in arguments with owners.
On a fixed unit, read the published installation facts as planning facts, not as a claim about any particular coating. For example the PowerDe HW02 steam cleaner product page lists 220 V working voltage, 6 kW heating power, an 80 L SUS304 tank and a tap-water inlet with a 1/2 inch four-point internal-tooth joint, and describes dry and wet steam. Those numbers tell you what the wash bay must provide and roughly how long a tank lasts between refills; they do not tell you that a given antifouling coating or an old gelcoat surface can be cleaned safely. That answer only comes from a test on the boat in front of you.
Survey the berth or the bay before the boat is committed
Between work cycles you rarely get a second attempt at the utilities. Before the window opens, walk the position and answer: is there a protected 220 V supply at this spot, or only somewhere else in the yard, and does the cable run cross a fairway, a pontoon finger or a public walkway? Where is the nearest water connection, and how far is the hose from the coupling to the stern of the longest boat you service? Where does the runoff go, and what has to be collected before it reaches the water? Marina runoff that carries antifouling residue, oil and grit is not an afterthought; ask the marina what collection or separation they require, and put the answer in the method sheet. Then check gate widths, pontoon steps, cleats, and the height you need to reach the rubrail and the topsides safely.
Wet decking, cord management, and the time needed for a surface to be dry enough to hand over are scheduling constraints, not housekeeping details. Say them out loud at the planning stage so the booking desk knows what a cleaning slot really costs.
Run one reference job and measure against your own baseline
Pick the dirtiest boat of the type you clean most and run the method with your own crew inside a realistic window. Record the facts you will need when you quote the next one: time per surface group, number of water refills and the walking distance behind them, volume of runoff you had to handle, and the interval before the boat could be handed back. Compare against how the yard works today, not against a brochure. Freeze the distances and speeds that worked, and note where the method broke.
Write acceptance and hand-back checks that an owner can be shown
Decide what "done" means before the work starts, in terms you can check: the growth band is gone at the waterline, no loose residue sits in the rubrail channel or the anchor chain locker, no water stands in a deck fitting or a cockpit locker, the seacock area is dry and was never sprayed, canvas and windows were not sprayed, non-skid is dry underfoot, the deck is dry and slip-free for boarding, and photographs from agreed angles show the result. Add one line per boat to the log: date, vessel, surface groups done, mode and lance distance, operator, refills, anomalies, and who signed the hand-back. That line is what protects you when a coating question appears a month later.
Keep the machine inside the same maintenance discipline as the yard
A cleaning machine that quietly loses performance shows up as a "bad cleaning day" on a boat. Tap water in coastal and marina areas is often hard, and scale inside a heater and a tank is a normal cause of weak output and of stoppages; the product page for the HW02 lists a water-shortage protection among its protection items, and the practical response to any protection trip is to check the cause and record it rather than reset it repeatedly. Name the person responsible for descaling, hose and coupling checks, filter cleaning and nozzle inspection, and put those tasks on the same preventive schedule as the travel lift and the compressor. Where a protection trip stops a job in the middle of a charter handover, the cost is the booking, not the part.
When the layout does not fit the catalog, ask with information
Fleets rarely share one answer: a pontoon berth, a hard-stand bay, a locker with no drainage and a limited power supply each need a different arrangement. If the standard configuration does not match your site, send the surface list, the fixed-angle photographs, your timing sheet, the utility findings from the berth walk, and the hand-back interval you need, and ask about customized steam cleaning equipment rather than guessing a model number.
If you want that site survey and documentation work done with you instead of for you, an integrated engineering team can carry the commissioning and the written method with your crew. To start the conversation, contact PowerDe with your berth or bay layout and your cleaning windows.
