The Post-Race Washdown Checklist

Rinse the salt off while it is still wet, work top to bottom, keep pressure off the seals and electronics, dry the sails, and log every fault. That five-part routine is the least glamorous habit on a Grand Prix campaign and one of the highest-value: it protects hardware and sails worth more than the hull, and it feeds the maintenance system that keeps the boat race-ready. What follows is not a reminder to hose the boat down — it is the electrochemistry and mechanical detail that decide whether the routine actually works.

Why the freshwater rinse actually works — the chemistry

Seawater is roughly 3.5% dissolved salts by mass, and the dominant anion is chloride. Chloride is not incidental; it is the specific agent of nearly every corrosion failure on the boat, and understanding why explains every line of the checklist.

Both of the metals that matter — the 316 stainless in fittings, fasteners and shafts, and the anodised aluminium of spar, tracks and winch drums — rely on a thin passive oxide film for their corrosion resistance. On stainless it is a chromium-rich oxide a few nanometres thick; on aluminium it is the aluminium-oxide anodising layer. Chloride ions adsorb onto and locally rupture that film, and once the film is breached in a spot where oxygen cannot get back in to re-form it, the exposed metal keeps dissolving. This is why stainless corrodes preferentially in the hidden places — under a car, inside a swage, at a clevis-pin bore — rather than on the open, oxygenated deck.

Inside those occluded gaps the process is autocatalytic: metal dissolving in the crack pulls in more chloride to balance the charge, the trapped electrolyte hydrolyses and turns acidic (local pH can fall toward 2–3), and the acidity accelerates the attack, which pulls in more chloride again. That is crevice and pitting corrosion, and it is why a fastener can look perfect at the surface and be half-consumed in the bore. A directed rinse while the chloride is still dilute and in solution is the only cheap intervention; once the cell is established, no wash reverses it.

The second reason to rinse now is that dry salt is deliquescent. Sodium chloride absorbs water and goes back into solution above about 75% relative humidity, and the mixed magnesium and calcium chlorides in sea salt do so even lower. In a humid Brisbane marina the "dry" salt film on a winch drum or a terminal is not inert — it re-wets itself into a concentrated brine every night and keeps the corrosion cell alive. Rinsing removes the chloride before it can concentrate in the places you cannot reach — see salt corrosion prevention for the underlying chemistry.

Two operational rules fall straight out of this. First, wet, wait, then wipe: dry salt crystals are hard (Mohs ~2.5) and dragging a sponge over an unrinsed deck laps them into the gelcoat and anodising, leaving a micro-scratch web that then holds more salt. Flood the surface, give it a minute to dissolve, rinse again, and only then let cloth touch it. Second, use low pressure. A pressure washer runs at 80–150 bar and drives chloride-laden water straight past labyrinth and lip seals that are designed to shed spray at near-static pressure — into winch races, bearing shields, hatch gaskets and connector housings — and emulsifies the grease you want to keep. A hose at mains pressure floats salt off in dilute solution; a jet injects it into the exact occluded geometry where crevice corrosion begins.

Order of operations

Work top to bottom and windward to leeward, so you never rinse chloride down onto surfaces you have already cleaned. The sequence is dictated by where salt concentrates, not by convenience.

1. Rig and spars first. Wet the mast, boom, standing rigging and halyards from the masthead down. Spray driven up the rig runs down all day and concentrates at the base; on a square-top-mainsail fractional rig the head lock, halyard sheaves and mast track are the first to load up.
2. Deck, then hardware. Flood the deck, wait, rinse again, then work the fittings: winch bases, tracks and cars, blocks, clutches, padeyes, cleats and the recess around every one of them.
3. Cockpit and below-deck fittings. Under-deck block cars, halyard exit boxes and turning blocks trap salt and almost never see fresh water.
4. Canting keel trunk, canard case, bowsprit tube and appendages. These are structural, high-load and sealed against the sea, and they get their own section below. Do them on the way to drying and stowing.
5. Sails and lines run in parallel — get them rinsing and drying early so they are ready to stow when the boat is done.

What to flush, and how

Winches. Rinse the drum and base thoroughly to float off surface salt and grit; the pack-up aim is to stop chloride reaching the internals, not to service the winch. Servicing — stripping, solvent-cleaning the races, re-greasing — is a scheduled job, typically at least once pre-season and twice a season for a boat living in salt water. When it is done, use a manufacturer-grade waterproof winch grease (Harken, Andersen, Lewmar all sell a medium-viscosity, salt-water-resistant lithium-complex grease intended to be renewed annually) on the gears, bearings and main shaft — and observe the rule that catches people out: never grease the pawls and springs. Grease viscosity that is fine for a gear tooth is far too high for a sprung pawl; it makes the pawl sluggish so it fails to spring back and reseat, and the winch can then back-wind under load — a genuine safety hazard. Pawls get a light machine oil only, at the viscosity balance point where it is heavy enough not to wash out yet light enough to let the pawl flick freely. See winch service basics and winches explained.

Tracks and cars. The genoa, jib and mainsheet/traveller tracks accumulate salt and grit in the teeth and under the cars, where it grinds the recirculating ball or Torlon bearings and stiffens the traveller. Rinse the full length, run the car end to end while you flush so fresh water reaches the loaded ball tracks, and give particular attention to the leeward ends that sat in spray all race. Grit between ball and race is what turns a free-running car draggy and then flat-spots the balls.

Blocks and clutches. Rinse ball- and roller-bearing blocks and cycle them under the hose so water reaches the sheave bearing and side plates. Clutches trap salt in the cam teeth and around the line — open the cam and flush through, because a salt-and-grit-loaded cam both slips and saws the cover of the line it holds. Grit here is what turns a smooth block notchy and chews the sheet running over it — see block and clutch inspection.

Electronics and connectors. This is where restraint matters most, and it is a corrosion problem, not a waterproofing one. Displays, masthead units, sensors and their connectors are sealed to shed spray, not to survive a jet; light misting only, then wipe the screens with a microfibre cloth, and never aim the hose at a connector back or plug housing. The failure mode is chloride wicking into a multi-pin connector, where it bridges pins, forms a galvanic cell between dissimilar plating and drives green copper-chloride corrosion that raises resistance until the channel drops out — usually intermittently, at load, which is the hardest fault to chase. Best practice at build and service is adhesive-lined heat-shrink over the joint and a dielectric grease in the housing to exclude the electrolyte; a contact cleaner such as DeoxIT lifts light oxide before re-greasing. At the dock the job is simply to keep water out of connections while rinsing salt off everything around them. More in race boat electronics guide and sailing instruments and electronics.

Lines. Rinse sheets and halyards, especially the working sections that render through clutches and blocks. Salt-laden line is measurably stiffer, holds grit that abrades the cover from the inside as it flexes over sheaves, and — on the aramid and HMPE cores this boat runs — retained salt crystals work into the core and accelerate internal-fibre fatigue (rope wear guide).

The appendages: canting keel, canard and bowsprit

This is the section that separates a race-boat washdown from a cruiser rinse, and it is where the previous generation of this checklist was simply wrong. The Melges 40 does not have a fixed keel. It carries a carbon fin keel that cants electrically to around 45 degrees each side, a large retracting daggerboard/canard forward to carry the lateral load the canted fin no longer provides, twin rudders, and a retractable carbon bowsprit (cant angle, mechanism and geometry should be verified against the class rules and the boat's own systems manual — treat the numbers here as public-domain class description, not a spec sheet). Each of those is a moving, sealed, high-load interface with the sea, and each is a salt trap the deck rinse never touches.

Canting keel trunk and mechanism. A canting keel is swung by a mechanism inside the hull — typically a hydraulic ram or an electro-hydraulic drive — acting on the head of the fin, which pivots on a longitudinal bearing at the hull surface. Every cant cycle drags external seawater across the trunk seal and works it around the pivot bearing, so chloride accumulates exactly where you least want it: on a highly loaded bearing and on hydraulic ram seals and rod. Flush the trunk mouth and pivot area with fresh water, rinse any exposed ram rod, and while you are there look and listen — a change in cant time, a new noise from the ram, or any hydraulic weep is an early symptom of the canting-ballast-system failures that have retired maxi yachts mid-race (a broken ram forced Wild Oats XI out of the 2016 Sydney–Hobart, and industry experience is that a meaningful fraction of canting yachts have suffered a CBS failure at some point). Actual servicing of the hydraulics, seals and bearing is a specialist scheduled task — the washdown job is to keep chloride out of it and to catch the warning signs.

Canard/daggerboard case. The forward board runs in a case that is open to the sea and takes grit and salt every time the board is raised or lowered. Rinse the case mouth and, if the board is out, wipe salt and any grit off the board faces before it goes back — grit in the case abrades the bearings or gaskets and scores the board.

Bowsprit tube. The carbon sprit extends and retracts through a tube and bearings that sea spray and the tack line drag salt into all race. Extend it, rinse the exposed section and the tube mouth, and dry it before it retracts so you are not stowing brine inside the tube against the bearing.

Rudders and fairings. Rinse the twin rudder stocks at the bearing and the keel-hull and rudder-hull fairings. Salt and grit here abrade the fairing and — more importantly — hide the hairline cracks in carbon and fairing that you most want to catch early; inspect as you rinse (carbon inspection guide).

Drying and stowing

Getting the boat wet is the easy half; drying it is what actually protects the gear, because a rinse that leaves standing water in an occluded space has just refilled the crevice cell with fresh electrolyte.

Sails. Rinse the heaviest salt off, then dry the sails as far as the day allows before bagging — and understand what you are protecting. A modern inventory is either film-on-scrim laminate (a load-bearing scrim of aramid, carbon or Vectran bonded between polyester film) or a filmless thermoset membrane (continuous filament tapes laid to the load map and cured under resin). Both punish being stowed wet and salty. The polyester film and the adhesive tie-layers in a laminate are vulnerable to hydrolysis — water chemically attacking the polymer bonds — and because the film is impermeable, salt and moisture trapped between the layers cannot dry out and sit there working on the adhesive. Retained salt is hygroscopic, so a damp salty sail never truly dries in the bag, and the adhesive layers and any taffeta backing are ideal mildew substrate; mildew stains the laminate, degrades the film and resin, and shortens both the competitive shape-life and the serviceable life of a very expensive inventory. Flake or fold to the sailmaker's pattern so panel loads stay off the bias and out of hard creases; never break a sharp crease across a laminate or membrane, which locally fractures fibres and film; and never seal a wet sail in an airtight bag below for the week. If sails must stay aboard, ventilate the space.

Deck and hardware. Chamois the deck or let it dry, and open hatches and lockers to vent below. A closed, damp hull grows mildew in the accommodation and keeps every internal fitting sitting in humid air above the deliquescence point — a slow corrosion cell on everything you cannot see.

Lines. Coil or flake and stow so air reaches them; do not seal wet line in a closed bag, where trapped salt and moisture accelerate the internal-fibre fatigue described above.

Electronics. Wipe displays dry and confirm connector areas are dry before covers go back on, so you are not sealing a brine film against a plug for a week.

Common misses and failure modes

The parts that get skipped are the ones you cannot see — which is exactly where crevice corrosion initiates. Under-deck block cars, leeward track ends, stanchion bases, halyard exit boxes, the mast track, folding padeyes and winch-base recesses all trap chloride and rarely get rinsed. On this boat the keel trunk, canard case and bowsprit tube are the other blind spots. A deliberate pass with the hose aimed low, into recesses and along seal lines catches most of what a top-down deck rinse leaves behind.

The failure modes follow directly from what gets missed:

• Wiping before wetting — laps hard salt crystals into gelcoat and anodising, seeding the micro-scratches that hold more salt. Fix: flood, wait, rinse, then wipe.
• High-pressure washing — drives chloride past seals into bearings and connectors and strips grease from races. Fix: mains-pressure hose only.
• Greasing pawls — sluggish pawls fail to reseat and the winch back-winds under load. Fix: light oil on pawls, grease on gears and bearings.
• Ignoring the keel and bowsprit — every cant and every sprit cycle drags salt across seals and bearings, and a missed hydraulic weep is a mid-race failure waiting to happen. Fix: rinse the trunk, canard case and sprit tube, and log any change in noise, cant time or a weep.
• Stowing sails wet — hydrolysis and mildew in the film and adhesive layers, and lost shape. Fix: dry before bagging, ventilate, no hard creases.
• Sealing the boat up damp — accommodation mildew and internal corrosion. Fix: vent hatches and lockers.

Good looks like an evenly wetted boat rinsed top to bottom, the appendages and their seals flushed, dry sails flaked to pattern, and a completed fault note. Bad looks like a hosed-off deck with salt still crusted in the tracks and around the keel trunk, sails stuffed damp into bags, and a mental list of niggles that evaporates by the weekend.

The maintenance note

The most valuable two minutes of the day: write down what you noticed racing — a notchy winch under load, a chafed sheet, an instrument that dropped out on a header, a new noise from the keel ram, a weeping fitting — while your hands are still on the gear. Captured now, it becomes a scheduled repair with the right spare pre-staged; left to memory, it is rediscovered at the worst possible moment. On a canting boat some of those notes are safety-critical, and the earliest warning of a CBS problem is almost always a small change an attentive crew felt and logged before it became a failure. The post-race note is the single most reliable input into the annual maintenance schedule and the spare parts inventory.

On a one-design Grand Prix campaign the stakes are sharper still. In a fleet where every Melges 40 is mechanically identical, boat speed and reliability come from condition, not equipment — a fleet-standard block gone notchy from salt, a car running on grit, or a keel cant that has slowed a fraction because chloride is working on the mechanism is a self-inflicted handicap you carry into every race. The washdown is where that edge is protected: flush the chloride while it is still dilute, dry the gear so no crevice refills, and log the faults. Paired with the pre-race inspection, it bookends every sailing day and keeps both the boat and the maintenance system in order.