Reward for lost Kraken!
Join Date: Apr 2006
Thanked 142 Times in 139 Posts
Rep Power: 11
"The pressure washer was a pump up by hand type"
Then it was a "pump sprayer" not a pressure washer. $20 at Home Depot for the cheapest plastic ones--and plastic is better than metal for bleach.
Wash it out, and wash the boat off, when you are done. Bleach is after all a caustic substance. It kills mold, that's why he used it. Adding some SOAP or detergent would also help to remove dirt, bleach alone doesn't do that.
But after you clean the boat, you really should WAX the whole hull. Gelcoat oxidizes, wax stops the oxidation. Just like cars, if you don't wax the finish it takes UV damage and oxidation and then ten years down the line--it's time for an expensive paint job, too late to save it. Non-skid wax on the deck, shiny stuff on the hull.