What's a good, effective chemical product that will remove boat scum. I pulled my boat for the season today and there was lots of scum buildup. Usually i haul my boat home and clean and wax it every two weeks but this time i let it go almost a month. I tried my power sprayer, soak and water but these were ineffective. I think i need a product that has acid in it to chemically remove the scum. Thanks Tug