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Sounds like you've already cleaned your boat but just in case. I've had very good luck with a product called Jomax for my spring cleanups. It gets all the winter dirt, black mold that forms when the boat is under its winter cover off with almost no scrubbing, even the no skid areas of the deck. I wet the boat, mix the solution per instructions (water / Jomax / bleach) in a pump sprayer, spray it on and let it sit a few minutes and then rinse it off. The boat looks like new when I'm done. Most hardware stores will carry it, it's primarily used to clean houses in preparation for paint.