How to Wash a Boat

These tips will turn your boating chore into a labor of love. Somehow, your neighbor’s 15-year-old boat looks showroom new. How? Elbow grease, my friends. Elbow grease. But, for me, that work doesn’t include lugging a bucket of soapy water around.

Washing your Boat

Most boat soaps suggest several ounces of soap per gallon of water. That gets a good suds going and, when applied with a sponge or soft brush, does a good job of lifting dirt. It also does a good job of wasting soap.

A utility spray bottle from a discount or hardware store costs a couple of bucks or less. It’s better to use the soap concentrate straight if the spray bottle will pump it, but you might have to dilute the soap. This bottle from Walmart sprayed Blue Coral soap straight. Some boat soaps are of higher viscosity and are apt to need watering down. Start with 2 parts soap and 1 part water. A soap that won’t hurt your car finish won’t hurt your boat.

Hose down the area of the boat you want to wash, rinsing away loose grime, then shoot a few stripes on it with your spray bottle. Brush it in, and swirl it around. The more-direct application of soap adds emulsive dirt-lifting power. When you’re done, rinse it away.

Swab The Deck

There is no substitute for a good deck wash on a nonskid deck surface. Star brite’s Deck Cleaner (about $20 per gallon, is my go-to. In comparative tests, it has cleaned wine, grease and fish-blood stains better, and kept subsequent spills from staining the deck. It contains PTEF, a chemical considered a hazard in California, but it offers a sealing effect on diamond-pattern nonskid.

Once the boat is washed, spray the cleaner on the deck, brush in, rinse, then spray and brush again, but let the cleaner dry in place.


Use a detailer spray to wash the dashboard, consoles and compartments. Make sure the spray sports a UV protectant. There are plenty of good ones, but I lean on Lucas Slick Mist Marine Spray Wax ($7.99, To keep it off of tempered glass, spray it on a microfiber cloth and wipe the dash. It does a nice job of cleaning acrylic windscreens, so direct spray is A-OK. Wipe it dry with a microfiber cloth.


If your boat upholstery is fishy with blood and slime, use the spray-soap-and-hose approach, but then wipe it down with a vinyl cleaner and protectant that has a strong track record like 303 Marine Protectant ($9.59, Wipe it on, leaving a film in place to dry and seal your vinyl.


Star brite makes a three-brush set of soft, medium and coarse brushes that float on an interchangeable extendable handle. Use the blue soft brush on the hull and interior, and the yellow medium brush on the bottom and nonskid deck. The white coarse brush is for stubborn spots and waterline stains (from $40,

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