I have used this on two boats now to clean both the hulls and the out drives, it works incredibly well and with very little effort. I have even used it on my Ford pick up running boards and they came extremely clean where many other products i tried would not make a dent in the scum that was on them. This is a great product. Bio Clean just needs to do something about he shipping costs they are very high and make the product hard to buy

This product removes dried on skum, slime, and whatever that sticks to our boat when we leave it in the water for days. It removes stuff that nothing else would. Our boat went from a rough, white caulk film to a smooth, shine surface again. This is a great product!

Best product for removing water spots from boat hull without damaging the finish or shine. I have been using this for several years.

I was pleasantly surprised at how well this product worked (better than toilet bowl cleaner in my opinion). My hull didn't have heavy build up but there was a scum line and this cleaner removed it. Its not magic, I still had to crawl under the hull and scrub it in with a brush but it's a good product and I will buy more when I run out.

This product was excellent. I sprayed it on the residue on the hull of my boat, let it set about 15 minutes, and used a power washer to wash it off. I really like the gel consistency of the product as it stayed in place when I sprayed it on the surface of the boat. I felt the price was reasonable and will order it again. I am looking forward to trying other Bio-Kleen products.