Hi Out there,<br /><br />Question - I have a fiberglass boat with white gel-coat on interior. I invited someone fishing, and he wore running sneakers with black soles on my boat. After we got home, I noticed that in the area where he was fishing, there were black streak marks from the soles of his shoes EVERYWHERE!!<br /><br />I tied soap and water with a stiff brush, I tried hull cleaner with a stiff brush. Nothing. The marks fade a little, but they're still there. Does anyone have any ideas? <br /><br />Thanks!