How to wash a boat

The short version: Rinse with fresh water, wash from the top down in small sections with a boat soap, rinse again, and dry it with a chamois to avoid water spots. Use a soft brush, skip household dish soap, and never scrub gelcoat with gritty cleaners.

On this page: What you need Bucket or foam cannon? Steps What to avoid How often to wash Common questions

What you need

• A wax-safe boat soap (see soap options)
• A soft brush or wash mitt
• A clean bucket and a hose with fresh water
• Optional: a foam cannon for applying soap, if you prefer it to a bucket (see below)
• A chamois for drying, or a spot-free rinse filter for the final rinse

Bucket or foam cannon?

Both are ways to get soap on the boat. A foam cannon attaches to a pressure washer, or a garden hose in some versions, and covers the boat in thick soap foam. A bucket is the simpler setup.

Either way, you still wash with a soft brush or mitt. The foam cannon only changes how the soap goes on. I prefer a bucket, and I recommend one if you're washing multiple boats a day in different locations.

Steps

1. Rinse first. Hose the whole boat with fresh water to knock off loose dirt and salt. Rinse after every outing, especially in saltwater.
2. Mix the soap by the label. A stronger mix is not better. Harsher, more alkaline soaps clean aggressively but can strip wax.
3. Wash top to bottom, one section at a time. If you lather the whole boat, parts of it dry before you get to them.
4. Rinse thoroughly. Leftover soap leaves spots and streaks.
5. Dry right away with a chamois. Air drying is what leaves water spots.

What to avoid

• Salt water for washing. Practical Sailor notes salt is abrasive to gelcoat.
• Gritty cleaners. Powders like Ajax or Comet can damage thin gelcoat.
• Household dish soap. It strips wax. The only time to use it is when you plan to re-wax right after. Otherwise, never.

How often to wash

Rinse with fresh water after every outing, especially in saltwater, since dirt and salt left on the surface wear it down. For a full wash, in Ohio we wash boats weekly or every other week, depending on use. In Florida we recommend every other week.

Common questions

Will washing remove my wax?

A neutral boat soap used at the label strength should not. Strong alkaline cleaners and dish soap are the ones that strip it.

Can I pressure wash a boat?

Yes, carefully. I only pressure wash hulls that need it. Use a wide fan tip, never the narrow red or yellow tips, and keep the nozzle at least 8 inches from the surface. Stay off decals, fittings, upholstery, canvas, and any cracked gelcoat. When in doubt, use the setting your pressure washer recommends for cars, and wax afterward.

If you buy through a link on this page, I may earn a commission at no extra cost to you. How that works. Last checked October 2026.