So I just purchased a Catalina 22' and am in the process of restoring it. I have scrubbed the deck clean, but I can't get the seats in the cockpit clean. There are extremely small diamond shaped groves in the seats, and at first I just thought it was dirt, but now I think its algae. The groves are too small and I cant get it with any brush or scrubber, so I am curious if anyone knows of any method or like a chemical that will kill the algae and get it out of the crevasses. This is driving me crazy cuz no matter how much I scrub, it still looks dirty. So I am looking for something that will not only kill it, but get it out of the small groves.

thanks