Has anyone had experience with this product?It sounds pretty good. I have some black streaks down the side of my boat where the debris washes when it rains. It's quite unsightly and I want to make sure I clean it all off before I wax it. When it was in the water last summer I tried to clean it with several things that didn't get it off.http://www.nuhull.com/They also have a product on this site called Champ - which is also for cleaning. Not sure what the difference is between the two.