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Please be VERY careful with a pressure washer.

The wrong tip will damage the gelcoat, rip a cushion or force water into places it should not be. The washer will remove dirt but not the dullness. The lack of shine is from the top layer of gelcoat having oxidized.

You need to kill the spores of the mold. Bleach.

Remember to thoroughly rise off any cleaner that has an acid ingredient.

To remove the oxidation you need to detail the boat.It is a labor intensive process that can be made easier with some tools. A good random speed polisher/buffer and a cordless drill.

My personal choices:

Polisher:https://www.amazon.com/PORTER-CABLE-7...e+polisher

Brush head: https://www.amazon.com/Chemical-Guys-...MFPJ1BKQNK

I have a new-to-me 1992 Outrage that needs to be cleaned up. I will start by inspecting the boat carefully and sealing any holes. Old holes covered with a screw will get reinstalled with sealant just in case.

I will start with a bucket of water and Simple Green, a good biodegradable cleaning product. For the non-skid I a brush attachment.

After a good rinse, I will buff out the hull starting with a mid-cut restorer using a wool bonnet on a polisher. If you have a chalky film, start with a heavy duty compound. Follow that with a finishing product then boat wax.