STAR BRITEInstant Hull Cleaner - Easily Remove Stains, Scum Lines & Grime for Boat Hulls, Fiberglass, Plastic & Painted Surfaces - Wipe On, Rinse Off Formula - 128 Ounce Gallon (081700)

Literally two minutes, removed the yellow tint off my new to me boat. One review suggested wetting the trailer first, also we used a spray bottle that could be set to stream not just mist to get under the boat hull area. We’re buying a brush and the hull wax from this company since this product worked so well.

Just purchased a boat that hadnt been cleaned in 4 years. Used my rechargeable scrubber with 6" sponge attachment to dip and scrub with star brite. As it foamed the scum line was erased. Some spots took a second pass, but overall terrific product.

Why did you pick this product vs others?:This is the best product for cleaning a boat that’s been in the ocean. The muck from the water leaves a brown stain on the hull. Nothing else has completely removed it except this. You spray it on and can instantly see it dissolving the muck. I don’t use anything else.

worked great, but I did need two applications and I felt like I used more than I should have needed. At the end the boat was perfectly clean and that's what I wanted!

I tend to write reviews on either good products or bad products. This product is AMAZING and saved me HOURS. As others have stated the bottle did leak a bit upon delivery, the bag inside had some moisture and the seal had broken, maybe 1-2 oz. had leaked. Not the end of the world. I had this product, a Ryobi powered sprayer which I emptied the entire gallon into. (ASIN - B07SYC7JM2). It holds 95% of a gallon. As for what scum I was trying to remove. We keep our boat in the water 6 months of the year. Our boat is a surf boat with surf gates, fresh water exhaust, swim platform etc. These various parts including the metal parts seem to really cake on slime and scum. Last year I tried 4-5 different products, Magic sauce, vinegar and baking soda, a scrub brush, a 3200 PSI power washer, even a powered handheld dremel brush. I, eventually after multiple days of work, got most of the scum off but hard to access parts and in cracks (especially metal - power wedge and FAE) was near impossible. I sprayed roughly half a gallon all over and before I even got back around to where I started the scum was dripping off. I rinsed and repeated in some spots, like the FAE, rinsed again. No joke, our boat looks brand new. Never been more amazed with how much time this saved, how well it worked, how much little effort it took, and the overall results. As long as we have a boat, I'll be buying this twice a year. Bonus - even applied a little to the trailer and same result!

Works wonders! Didn't even need to scrub anything just spray and rinse. Wear gloves and a mask its strong and could be irritating to skin

Outstanding product! Hope amazon continues to handle. Only thing that actually gets Pittsburgh River scum off!

Worked well taking most of green stuff off of bottom of boat. However there were a few spots that required a lot of extra scrubbing. Would be better if it was slightly stronger. Much cheaper than having the marina clean the hull.