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.

I wanted to use it because it was biodegradable and not an acid cleaner. After using it, most of the boat got cleaned, however, it still left a slight film line on the side of the boat. Even after spraying numerous times, I could not get it out. However, as I said, most of the boat got cleaned.

I used it on my 27' sailboat deck and cockpit. It was so easy and made the yuch that built up come off easier than anything else I have ever used. 5 Stars from me.

This product is amazing. I used it to clean copper pots that had a lot of buildup because I had been too lazy to polish them. I soaked the pots for a week and the mess just wiped away.