3M Mildew stain remover

3M does not actually make a specific product called "3M Mildew Stain Remover." However, they do offer a product called 3M Marine On-Deck Cleaner & Stain Remover that can tackle various boat cleaning tasks, including removing mildew stains.

Here's a breakdown of 3M Marine On-Deck Cleaner & Stain Remover:

Application: Multi-purpose cleaner for use on various marine surfaces like fiberglass, gelcoat, and vinyl.
Benefits:
Removes mildew stains along with other boat cleaning tasks like fish blood stains, grease, and scum.
Easy to use with a spray-on, scrub, rinse application (always refer to instructions).
Considerations:
Always follow the manufacturer's instructions for proper use and safety precautions, including wearing gloves and ensuring adequate ventilation.
Test the product in an inconspicuous area first to ensure compatibility with the surface you're cleaning. Some cleaners might be too harsh for certain materials.
Here are some alternative mildew stain removers for boats:

Bleach solution (diluted): A common and effective option, but use caution and proper ventilation as bleach can be harsh on skin, clothing, and fumes can be irritating.
Vinegar solution: A milder option than bleach with some mildew removal properties. However, it might not be as effective for stubborn stains.
Commercial mildew stain removers: Many other brands offer mildew stain removers specifically formulated for marine use. These might be a good option if you need a more targeted solution.