Instant Hull Cleaner - Gel Spray

Great Hull Cleaner — Works Fast and Makes Boat Look New! We recently used this hull cleaner on our boat and were very impressed with how well it worked. This product quickly removed waterline stains, scum lines, rust marks, and general grime without a ton of effort — just spray it on, let it sit briefly, then rinse off. What We Liked: ✔️ Easy to use — no heavy scrubbing or elbow grease needed; it dissolves stains almost instantly. ✔️ Very effective on fiberglass and painted surfaces — even tough stains like brown water line marks and fish blood came off. ✔️ Quick results — made a noticeable difference in appearance in minutes. ✔️ Great prep before polishing or waxing. Notes: 💧 Make sure to follow instructions and rinse thoroughly after applying. 🧤 We used gloves since it’s pretty strong and works best when handled carefully. Overall this has been a great addition to our boat care routine — cleans deeply and saves a ton of time compared to scrubbing by hand. Would definitely recommend it if you want your hull looking sharp again!

Had some stubborn grime built up along the side of my boat — the kind that laughs at soap, shrugs at scrubbing, and generally makes you question your life choices. Enter STAR BRITE Instant Hull Cleaner. Sprayed this stuff on and it went to work like it had a personal vendetta against dirt. The grime didn’t just loosen — it retreated. I swear I heard it scream. Cleaning suddenly required about 1/10th the effort, which is perfect because I’d rather be sailing than reenacting “The Karate Kid” with a sponge. Five stars. Works fast, works well, and makes boat cleaning almost enjoyable… almost.

Not as harsh as other products on the ground and concrete. Easy to spray on and gently scrub then power was off. Can do the whole boat in an hour or less.

This product always removes the grime from my boat hull. It is however aggressive and you will want to wear gloves and maybe goggles as well. One negative is it will bleach your concrete driveway, so recommend laying a large tarp under the boat.

One of those products that works as advertised or better.. spray on and watch it work with minimal effort. Took out brown stains and made hull look great. Suggest putting a coat of wax after cleaning with this product to prolong results

This is the best hull cleaner I have come across. It magically removes black stains without getting the power buffer out. It's made boat maintenance much easier.

I’m pretty anal about keeping my 18’ white and teal fiberglass flats boat clean and maintained. But over time it started developing a below-the-waterline stain that just didn’t come off with normal cleaning. I was dreading a lot of upcoming elbow grease to get it off. I started researching the best solution, came across recommendations for StarBrite Hull Cleaner, and ordered a bottle. As per instructions, all I did was spray, let it sit for a few minutes, then rinse off with a hose. I did use a cleaning mitten to help spread the cleaner evenly, but NO scrubbing was involved. There were a few stubborn areas that I had to treat a second time, but again, no scrubbing. After the second treatment the results were amazing! And so easy! There was no discoloration on the teal portion, and no damage to decals. I did not use gloves, and had no issues with my hands. I would recommend eye protection as it stings your eyes. One bottle was more than enough for my boat. I accidentally sprayed some on the inside bottom of an old stained cooler and it came out shiny white, so it’s got me thinking about other possible uses for this product. I highly recommend StarBrite Hull Cleaner. I haven’t yet cleaned the rear bottom hull (the part that’s so inaccessible while on the trailer), but it’s bugging the crap out of me because the difference is so dramatic!

Does not really clean a stain. I tried to use it on my boat as well as jacuzzi, you can see just a bit better after the cleaning, but not even close to what others are saying. I would definitely would not recommend. I ordered two of them, because of the reviews but regret it. I used one of them completely, still hopping that I am doing something wrong, however to real result.