The last boats come off the water between Labor Day and the first hard frost, and most of them go into storage exactly as they left the lake — salt film on the rails, scum at the waterline, a summer of UV baked into the gelcoat. Then the cover goes on, and everything you left behind gets six months to do its worst.
Spring detailers see the result every year: oxidation that was light in September and chalky by April, waterline stains that set like concrete, cabins that smell like a wet basement. This is the 2026 haul-out guide — what to clean, what to fix, and what to seal before the boat sits, with the products we stand behind for each step.
Why Fall Prep Beats Spring Recovery
Everything on a stored hull is a slow chemical process. Mineral deposits keep etching. Organic film keeps feeding mildew. Oxidation does not pause because the boat is on stands — gelcoat is more porous than automotive clear coat, and it keeps degrading in storage. The work you do in one afternoon at haul-out is the difference between a spring launch that starts with a rinse and one that starts with a compound and a machine. Clean, correct, protect, then cover. In that order.
Step One: Strip the Season Off
Nothing gets sealed over dirt. The day the boat comes out — before anything dries and hardens — give it the most thorough wash of the year.
Start with foam. Koch-Chemie Gentle Snow Foam is the pre-wash: high-foaming and pH neutral, it lays down an even, well-moistened foam blanket that clings to the whole surface for a long application time, and it will not corrode waxed or sealed surfaces. Run it through an iK Foam Pro 2 — a 1.5-liter pump-up foamer with chemical-resistant seals, no pressure washer required, which matters on a boat ramp or a storage yard with no hookups.
Where the season really stuck — exhaust staining, scum line, deck grime — enrich the foam with Koch-Chemie Green Star. It is a highly concentrated, phosphate- and solvent-free alkaline universal cleaner with an enormous dirt and oil carrying capacity, and its corrosion inhibitors give it high material compatibility with sensitive components like anodized aluminum. Work at 1:5 to 1:30 on exteriors, keep the reaction time short, and rinse thoroughly.
Then the contact wash: Koch-Chemie Nano Magic Shampoo at roughly 1:200 in the bucket — about 3 to 4 ounces in 4 to 5 gallons — washed panel by panel with a Rag Company Chenille Wash Mitt. It is a wash-and-wax, so the hull picks up 6 to 8 weeks of beading protection during the wash itself. Do not let it dry; rinse immediately. Textured non-skid is where a Drillbrush 4-inch medium brush earns its keep — non-scratch nylon bristles on a quarter-inch quick-change shaft, run off the cordless drill you already own. Dry everything with The Gauntlet, TRC’s Korean 70/30 twist-loop drying towel. Water you leave behind becomes a water spot you find in April. The full wash sequence is in our boat washing guide.
Fix the Gelcoat Now, Not in April
Run a clean hand down the clean hull. If it drags, or the color looks hazy where it used to throw a reflection, that oxidation is not going to improve over the winter — correction gets harder the longer it waits.
RUPES Marine Extra Cut is the compound for the job — a high-performance marine formula built to remove severe oxidation, deep scratches, and heavy swirl marks from gelcoat and marine paint, at home on fiberglass boats and RVs alike. Pair it with pads built for the substrate: the Lake Country Marine Master cutting pad puts fine-pore, rigid correcting foam on a flexible interface that conforms to hull contours, and the Marine Master finishing pad follows it for light-defect removal and final gloss on a DA polisher, with CCS technology extending work time and holding heat down. The complete process — compound selection, machine speeds, pad progression — is in our boat oxidation removal guide.
If the hull still passes the reflection test, skip this step. Correction removes material; do it when the surface needs it, not on a schedule.
Seal It Before It Sits
Protection is the whole point of fall prep. A sealed surface sheds the winter — condensation under the cover, storage-yard dust, the first spring pollen — instead of absorbing it.
The storage pick is Koch-Chemie Protector Wax. Its polyfunctional reactive components bond with the surface as a network, delivering deep gloss, long-term water repellence, and genuine easy-to-clean performance — and it protects rubber, plastic, and fabric top materials against fading and embrittlement, which is exactly what a boat under a cover needs. It works as a hot, cold, or foam wax, applied mechanically or by hand.
Two faster routes if the clock is short. Koch-Chemie Wet Gloss goes on while the boat is still wet from the final rinse — spray, rinse, dry — and leaves a smooth, highly hydrophobic surface that lasts for weeks, standalone or as a topper over an existing ceramic coating. Koch-Chemie Spray Sealant S0.02 is the dry-surface equivalent: one to two sprays per section, polish off, done — with visible color deepening and a proper beading effect. For everything that is not gelcoat, P&S Bead Maker covers paint, rubber, plastic, metal, and glass in one spray-and-wipe pass, with UV filters and stabilizers and a full cure in about two hours. A deeper comparison of every option lives in our boat wax and sealant buyer’s guide.
The Cabin: Clean, Dry, Deodorized
Interiors do not survive storage by accident. Anything organic left in the cabin — food residue, sunscreen on the vinyl, damp carpet — becomes the mildew smell you open the hatch to in spring.
Deep-clean fabric and carpet with Koch-Chemie MZR, the alkaline intensive cleaner that pulls oil, grease, soot, and everyday grime out of upholstery, carpet, and plastics at 1:5 to 1:50. Wipe down consoles, hatches, and smooth surfaces with Allround Surface Cleaner — ready to use, streak-free, and safe across plastics, stainless, and leather. Then feed the vinyl and rubber: Koch-Chemie Top Star is a care emulsion that leaves a semigloss, natural sheen, keeps plastic supple, and protects against UV — sponge it onto seat bolsters, trim, and every hatch seal on the boat. A dried-out seal is how covers leak.
Last move before the cover goes on: kill the odors instead of trapping them. The Bio-Bombs Vehicle Deodorization Kit releases chlorine dioxide gas that eliminates — not masks — smoke, sweat, and mildew funk in an enclosed space. Run it in the closed cabin, air it out, then button up for winter.
Do Not Forget the Trailer
The trailer sat in the water every launch and now it sits under the boat all winter. Hit the wheels with Koch-Chemie Magic Wheel Cleaner — acid-free and deliberately viscous, it clings to the surface while its reactive component dissolves embedded iron with a telltale red discoloration. Rated for painted alloy, high-quality chromed, and steel rims: two to five minutes of dwell, rinse with pressure, never on a hot wheel or in direct sun.
The Haul-Out Kit, Three Ways
The weekender. Gentle Snow Foam, an iK Foam Pro 2, Nano Magic Shampoo, a wash mitt, The Gauntlet, and Wet Gloss on the final rinse. One afternoon, and the boat goes into storage washed and sealed.
The full season reset. Everything above, plus Green Star for the scum and stains, Protector Wax instead of a quick sealant, MZR and Top Star for the cabin, and a Bio-Bombs kit before the cover. This is the package for a boat that earned its keep all summer.
The pro haul-out. The full reset plus correction: RUPES Marine Extra Cut on Lake Country Marine Master pads before the protection goes down. For marina crews and detailers doing haul-outs in volume, this is the service customers pay for in September so they do not pay more for it in May.
The Bottom Line
A boat put away right comes out right. Strip the season off with Koch-Chemie foam and shampoo, fix oxidation while it is still fixable with RUPES and Lake Country, seal every surface before it sits, and leave the cabin clean, fed, and odor-free. The few hours between haul-out and cover-on are the highest-leverage detailing hours of the whole year. Every surface. Every season. Every machine — including the ones that float.
Putting a fleet of boats to bed this fall? Call the shop at (402) 890-4589 — real pros, real answers. High Limit Detail Supply is a division of Whitehead Oil Company. If it runs, rolls, or floats — we help it shine.