Instant Hull Cleaner - 32 Oz Gel Spray - Easily Remove Stains, Scum Lines & Grime on Boat Hulls, Fiberglass, Plastic & Painted Surfaces - Easy to Use Formula (096132)

I was very skeptical at first, with how easy it said it’d be to use, just spray on and rinse off and the brown slime would be gone and boy was I wrong. Literally just spray it on wait a couple minutes and rinse off, took the brown slime right off. Amazing. One bottle did my 19ft boat with some left over. Every effective, no scrubbing, very easy to apply

We get rust lines under our boats AC, generator, and engine raw water thru hulls. I light spray of this product and the rust stains disappear. No need to wipe or scrub. Just make sure you 1) don't breathe in the mist/fumes; 2) rinse the hull thoroughly immediately after. Been using this for many years on many different boats, always with the same great results.

I don’t even own a boat. What I do own is a shower that had a nasty floor that no amount of scrubbing with many various kinds of cleaners would ever come clean. It was an embarrassment to even have guests use this shower. I was extremely hesitant to order this because of the price and the fact that several reviewers said the spray bottle kept getting clogged. But desperate times call for desperate measures. What a bargain even if I have to buy a new spray bottle every time I use it. Two applications and a bit of scrubbing and my shower looks brand new. I have less than 10 minutes total time in cleaning this shower. So I can’t tell you how it works on a boat hall but I can tell you on a fiberglass shower, it is amazing.!

My hull wasn’t extremely dirty however product did work well

This product worked where many others failed. Cleaning my dad's sailboat, it was badly stained with tannin from being anchored all summer in the river. Some scrubbing with a scotchbrite pad helped clean it faster. Photo shows the bow is cleaned, stern shows how bad it was before.

Best product on the market. Easy to use . Removes all the water stains

Cleans well but the nozzle stops working after about 10 min sucks when your old and laying under the boat 2nd time come on up your game

I had old hard water stains on my boat. See photos. I couldn’t get the stains off. This was the easiest and simplest way of getting rid of them! Took literally two minutes! Spray on - wait two minutes and rinse off! Didn’t even have to scrub. Now it’s my go-to product!