After spending the weekend in the water back in the swamps down here, my boat has what I call a scum line. Basically it's a brownish stain where the water line was on the hull while the boat was in the water. <br /><br />This boat has an aluminum hull painted black and I would rather not use what I used to use on my other boat, a little comet cleanser and a scouring pad. <br /><br />Just wondering if any of you have any suggestions on what might easily take this stuff off. <br /><br />Thanks!