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 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 own a 94 Grady White with ladder back seats. The cushions, although in pretty good condition otherwise, had dark mold spots especially on the top edge and sides that nothing I used would go away. Not any product from the marine store nearby nor even bleach. THis stuff .......works immediately upon spraying on the cushions. It's an awesome product and even removed the dark moldy patches from the ladder back seats themselves which had dark stains all over. Yes I needed to use an slightly abrasive sponge on the plastic seat stains, and they're not completely removed with the first bottle but that is why I will buy again. the cushions look almost new. Overpriced - yes a bit. But it's the best solution so far.

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!

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.

Amazing mildew remover! Redid the entire interior of an old vehicle!! Great buy

Did not remove the deepest mildew stains.

I've been struggling for years trying to find a product to remove black mildew/mold stains from my pontoon boat vinyl seating. When I saw the reviews on this product I had to give it a try, and I'm so glad I did. Some areas required more scrubbing than others (had this problem for a long time), but the results are fantastic. My neighbor told me the seats look like new. Highly recommend!

I bought this to remove the Maldo mildew from the inside of my hot tub cover. We used it once and it took care of the problem. We got more a year later to clean the inside of the cover again. it definitely got rid of all the mildew and the smell that was in the hot tub so it’s much more pleasant to use now.