I just pulled the cover off ,I saw black streaks so I decided to wash it. I used softscrub w/ bleach worked great at cleaning BUT the hull is now chaulky I washed the hull again,but it seems the gelcoat is blochy and I used Collinite 885 w/ a machine still looks cloudy, any ideas would help. the boat is a 1980 silverton hull was really nice till I F**#*ed it up thanks Guy