Heres the story... went out 4th of July weekend to a filthy mudhole called a lake with my new to me ('04) boat. Well after two days of sittin in the water there is a brownish waterline on the boat. I did wipe it down when I took it out of the water but it is still there. I also did a quick wash with marine boat wash. Any ideas on how to remove it short of a harsh hull cleaner? Also there are some dull spots in the gelcoat as well. How do you guys keep tour boat shiny? Thanks