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🛥️ Clean Like a Pro, Shine Like You Own the Dock!
Marine 31 Mildew Stain Remover Gel is a concentrated, thick gel formula designed for fast and safe removal of mildew and stains on marine surfaces, home patios, bathrooms, and more. Its quick 1-3 minute action and vinyl-safe ingredients make it ideal for maintaining boats, vinyl seats, fiberglass, and tile without damage or discoloration. Trusted by thousands with a 4.6-star rating, this 20oz unscented gel delivers professional-grade cleaning power in an easy-to-use spray.









| ASIN | B07V47SPF8 |
| Best Sellers Rank | #138,315 in Health & Household ( See Top 100 in Health & Household ) #56 in Household Mold & Mildew Removers |
| Brand Name | Marine 31 |
| Contains Liquid Contents? | Yes |
| Customer Reviews | 4.6 4.6 out of 5 stars (590) |
| Included Components | (1) Marine 31 Mildew Stain Remover Gel 20 oz |
| Item Form | Gel |
| Item Type Name | Mildew Stain Remover Gel |
| Item Volume | 20 Fluid Ounces |
| Manufacturer | Marine 31 |
| Material Features | Unscented |
| Number of Items | 1 |
| Scent | Unscented |
| Special Features | Concentrated |
| Specific Uses For Product | Bathtub, Deck, Shower, Sink, Tile |
| Surface Recommendation | Fiberglass |
| UPC | 082045630480 |
| Unit Count | 20 Fluid Ounces |
| Warranty Description | Standard Marine 31 Warranty |
K**S
Powerful
Arrived quickly. Works well. Do not get on clothes!
D**Y
Gets the mildew off!
Gets the mildew off for sure. Need to put on vinyl protectant once mildew removed
M**N
Top Cleaner
Works well on stubborn mold.
M**H
Best product so far.
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.
A**K
Worth every penny
If you have tough mold stains that your Spray 9 or Mold and mildew spray will not take out. This stuff will make your seats look like new. Spend the $30 bucks and thank me later. I got to say I don't say wow or OMG alot but this product is spot on. Follow instructions and be amazed. If you are tired of killing yourself with magic eraser and $15 dollar products try this once and you will love it. I went up to my friends boat and said hey if I get that off your seat is it worth $30 buck to you. He said yes. 5 minutes later I had $30 bucks and a high five.
L**.
Use caution and rinse well
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.
S**A
Best ever
Best spider crap stain remover you name it .. works perfectly
E**N
Amazing!
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.
Trustpilot
3 days ago
2 days ago