---
product_id: 141627828
title: "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"
brand: "marine 31"
price: "$63.46"
currency: USD
in_stock: true
category: "Marine 31"
url: https://www.desertcart.us/products/141627828-marine-31-mildew-stain-remover-gel-thick-gel-formula-marine
store_origin: US
region: United States of America
---

# Thick gel for targeted stain removal Fast-acting 1-3 min formula Safe on marine vinyl & fiberglass 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

**Brand:** marine 31
**Price:** $63.46
**Availability:** ✅ In Stock

## Summary

> 🛥️ Clean Like a Pro, Shine Like You Own the Dock!

## Quick Answers

- **What is this?** 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 by marine 31
- **How much does it cost?** $63.46 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/141627828-marine-31-mildew-stain-remover-gel-thick-gel-formula-marine)

## Best For

- marine 31 enthusiasts

## Why This Product

- Trusted marine 31 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Marine-Grade Safe:** Protects delicate vinyl seats and fiberglass without discoloration or damage.
- • **Thick Gel Formula:** Clings to vertical surfaces for deep, effective mildew removal.
- • **Rapid Stain Eraser:** Works in just minutes to restore surfaces without scrubbing fatigue.
- • **Versatile Power Cleaner:** Perfect for boats, patios, bathrooms, and more—one gel to rule them all.
- • **Unscented & Concentrated:** No overpowering smells, just pure cleaning muscle in every drop.

## Overview

Marine 31 Mildew Stain Remover Gel is a concentrated, thick gel cleaner designed for fast and safe removal of mildew and stains on marine surfaces, vinyl, fiberglass, and household areas like bathrooms and patios. Its quick 1-3 minute action and unscented formula make it ideal for professionals and enthusiasts seeking effective, no-fuss cleaning without damaging delicate materials.

## Description

Buy 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: Cleaners - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

## Features

- EASY TO USE: Simply spray the product directly onto the surface and allow to sit for 1 to 3 minutes. Agitate the surface with a brush or terry cloth towel and then thoroughly rinse and dry the surface.
- MULTIPLE USES: Safe for Boats, Vinyl, Tile, Grout, Patio, Coolers, and just about anywhere else that may accumulate stains. Marine 31 Mildew Stain Remover works like no other!
- SAFE: Erase these unwanted stains without the risk of discoloring, dulling or drying out vinyl seats or other fabrics. Even the most severe stains are no match for the cleaning power of Marine 31 Mildew Stain Remover.
- FAST WORKING: Marine 31 Mildew Stain Remover will quickly erase stains from marine surfaces including vinyl seat cushions, rubber fenders, fiberglass, gel coat, canopies & more without the need of abrasive power washing and/or scrubbing.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07V47SPF8 |
| Best Sellers Rank | #79,703 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #161 in Boat Cleaners #596 in Boat Hardware |
| Brand Name | Marine 31 |
| Contains Liquid Contents? | Yes |
| Customer Reviews | 4.6 4.6 out of 5 stars (601) |
| 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 |
| Model Number | M31-375 |
| Number of Items | 1 |
| Part Number | M31-375 |
| Scent | Unscented |
| Size | 20 Fl Oz (Pack of 1) |
| 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 |

## Product Details

- **Brand:** Marine 31
- **Item Form:** Gel
- **Material Feature:** Unscented
- **Scent:** Unscented
- **Specific Uses For Product:** Bathtub, Deck, Shower, Sink, Tile

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/51RthgY5PZS.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/71JQIKqYvEL.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/91TixMzOJ0L.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/81b9WFnqF6L.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/81-INQwQH3L.jpg)

## Questions & Answers

**Q: could this be used on a canvas boat cover?**
A: Try it on a small section first to see what happens.  I got some of it on my shorts and it bleached them.  It is powerful stuff.

**Q: Is it safe for cars?**
A: Yes

**Q: Is this safe to use on colored vinyl**
A: I used it on white and blue vinyl and it worked very well.

**Q: Is this only a whitener or does it also disinfect and get rid of the actual mildew?**
A: This is the best product I have found to get rid of mildew on my boat seats and other area. I would suggest if it kills mildew it would also disinfect as well.

## Frequently Bought Together

- 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
- 303 (30306) Marine UV Protectant Trigger Sprayer, 32 fl. Oz
- Marine 31 Mildew Stain Remover & Cleaner | Effective for Boats, Home, Patio, & Bathroom | Removes Mildew & Mold Stains | Powerful Cleaning Formula | 16oz

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-07*