Marine 31 Mildew Stain Remover Gel | Thick Gel Formula for Marine, Boat, Home & Patio | Removes Mildew & Stains from Bathrooms & Showers | Effective Cleaner | M31-375 | 20oz

I am a repeat buyer of this product, so I can tell you it really works! Gets out black mildew, dirt & grime without harsh & heavy scrubbing. It’s a miracle worker!

This stuff is amazing! We use it on our pontoon!

I had some mildew spots on my toon that vinyl cleaners wouldn't touch. This cleaner is a gel so it sprays on thick and stays in place pretty well allowing it to work. Most of the mildew disappeared after wiping it off after a couple minutes, and more stubborn stains were removed after a 2nd spray and mild scrubbing with a stiff bristle brush (I used something like an oversized toothbrush). I was very impressed by how well it worked, and the price was significantly less than other multi part marine cleaners that are being heavily marketed. The before and after pics tell the story.

I have used other products in the past that did a decent job, but over the years my vinyl seats have gotten worse and worse, the other products just couldn’t do it anymore. I was just about to give up and replace my vinyl but figured I would give marine 31 a shot. This stuff worked.. The gel helped suspend the product on vertical surfaces, and it literally just melted the mildew away. I lightly agitated with a magic eraser pad and then rinsed it off, best these seats have ever looked. If you have stubborn mold/mildew that won’t come off with other cleaners I highly recommend the marine 31 gel!

Arrived quickly. Works well. Do not get on clothes!

I was hesitant in the beginning due to the slight chlorine smell. I used it cautiously and did mostly spot cleaning and avoided seams as much as possible. I rinsed well. This is the best mold removal product I’ve found so far. I was surprised it removed or faded out so much of the worst mildew.

Easy to use spray and wipe. Excellent product simply put it works and compared to other products it’s the best

This works just like the advertisements and videos! Literally, you can spray and walk away! My bf has been trying to clean the mildew off of his light cream boat seats for three years w/ different chemicals w/ no success. After plenty of research, I thought I’d give it a try…and it worked! My bf is now looking forward to taking his boat out again because he’s not agonizing of having to clean it and it not come clean. I ordered the 20 oz. and it was able to clean my bf’s 21 foot deck boat. However, I noticed there’s some areas I missed, so I ordered another 20 oz. and protectant spray together.