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This stuff works great. Spray it on and scrub with a soft bristle brush and the scum is gone
Used this product many times before. Virtually labor free. I do brush it off with a wet soft bristle brush and the boat turns white again. It removes the yellow scum line that I get on my boat from it sitting in the water over several weekends. And it is useful on the marina's black hand prints (why can't they wash or wear gloves) on the boat as they take it to dry storage. I have used other Bio-Kleen products and would recommend each one.
We used this as the 1st step in the cleaning of our boats pontoons, and we were astounded at how well it worked. Took off about 5 years worth of algae/stains and made them look great!
Got rid of the ugly brown/yellowish hue we had on the hull of our boat in less then 5 minutes of soak time! We usually get acid washes for the removal of it and this works as well if not better and is less expensive! Well worth the money!
I would recommend this to anyone trying to get those tough yellow hard water stains. I tried other hull cleaners with no results,tried CLR and acid based products. This product is great! The hard water stains had been on this boat for 2 years. I sprayed it on, waited 10 minutes,and the stains wiped off like butter.Just wipe it dry or rinse it off,then go over it with a spray wax and it looks new again.