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this is a great product and works as stated. you need to let it stand on for about 5 minutes and then rinse. this is the fiberglass cleaner and it works on ALUMINUM. the aluminum cleaner , which I have purchased also works great but doesn't foam as much and runs off quickly. both are great !! a little pricey but its up to you how often you use it. give me a deal and ill buy more .
Purchased biokleen based on a flyer I picked up at a marina. Was skeptical, but for nine bucks I figured what the heck, nothing else was able to remove the yellow water stain around my hull. This stuff is amazing. Water line is gone, no scrubbing, just apply, wait and rinse.
This stuff works great. Spray it on and scrub with a soft bristle brush and the scum is gone
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.