STAR BRITE 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)

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.

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!

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.

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

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

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!

Holy Smokes! This product is the bomb! Having read many reviews when purchasing the Star Brite, I had high expectations for this cleaner to do wonders on the waterline of my boat; however, I had no idea how effective it was and easy to use. No heavy scrubbing needed, just follow the instructions…

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