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

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!

Wow, kept my boat in the water all season and this stuff got the nasty brown water stains right off, be careful with galvanized trailers though, this is tough on them, rinse it off the trailer immediately.

Great product! Works instantly on hard to remove stains. Will purchase again.

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.

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!