Marinamax Instant Hull Cleaner 32 oz, Boat Stain Remover

We’ve tried a handful if hull cleaners over the years, but this one stands out- especially for tackling the grime and debris that build up from the Chesapeake Bay. After just one use, my boat’s hull looked noticeably cleaner, with algae, scum and bay barnacles with minimal scrubbing. It cuts through the gunk fast and effortlessly and rises clean without leaving residue! What I really appreciate is that its tough on the build up but gentle on the surface and there is damage to our paint. If you boat around Baltimore and want to keep your hull in top shape, this cleaner is a game-changer!

Worked excellent

I have voted my entire life. Nine different boats. This is the best product I’ve ever used for removing the grime and algae from the hall of a boat. I just sprayed it on let it sit for a few minutes and then using a power washer, rinsed off, probably 95% of the debris reduced by scrubbing effort

Purchased to clean a stainless prop but not as expected . Was supposed to put in a plastic bag but I had it to the open which may have need the problem.

Excellent for rust. No scrubbing at allll

Product worked well on waterline stain but will not remove the hard water stain on my boat. Also, does not remove the exhaust stains on motor.

Worked great for cleaning hot tub shell to get rust off

Nothing instant in this product. Made very little, if any, headway on the water line of my hull. Used multiple times on same area with negligible results. Save your money and just scrub with good soap