Remove your boat from the water. Barnacles can only be removed when the boat is still moored if you have the proper diving equipment.
Use a handheld, stainless steel scrubber to scrub gently until all barnacles are removed and all you see is the ship's hull.
Remove larger barnacles with a plastic putty knife. Start with a plastic knife so there is less chance of gouging or scraping the hull of your boat. If it is ineffective against the barnacles, move up to a metal knife with dull edges.
Remove remaining barnacles with a stainless steel scrubber.
Purchase a pressure washer to remove large colonies of barnacles. Allow your boat several weeks to dry, if possible, before pressure washing.
Spray parallel to the boat hull rather than directly at the barnacles. You want to get underneath the edge of each barnacle. Focus on small patches until you've pressure washed the entirety of the boat. This pressure washing process will likely remove some of the paint on your boat. You should be prepared, therefore, to repaint after a thorough pressure washing.Remove Barnacles Step 6Bullet1.jpg
Apply a small amount of hydrochloric acid to any barnacle remnants after pressure washing. After applying, scrape off remaining barnacle plates with your plastic or dull-edged metal knife.
Apply a lime remover after applying the acid.
Wash the boat's hull thoroughly.
Apply a product designed to make the hull of your boat slick. This will make cleaning barnacles off your boat that much easier in the future.
Finished.
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