303® Mold & Mildew Cleaner + Blocker 16 oz.
SKU: 121556
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303® Mold & Mildew Cleaner + Blocker quickly and safely cleans and removes tough mold and mildew stains from virtually any water-safe surface. Not only does this product clean unsightly mold and mildew stains that have already formed, it will also help prevent mold and mildew stains from reoccurring on the treated surface. Unlike other mold and mildew cleaner products on the market, this product does NOT contain bleach, and will leave behind a fresh scent, with no strong odors to worry about during or after use. Safe for use on vinyl boat seats, vinyl or fabric covers, cushions, upholstery, plastics and more.

Made in the USA. The use of personal protective equipment (gloves, clothing, eye and face protection) is recommended when using this product.

Please Note: This item is flammable. Flammable items can only be shipped Ground to the 48 contiguous United States. This item cannot ship via Post Office.

To Use: Shake product well before use. Spray product onto the surface and scrub with a soft bristle brush or microfiber towel. Allow to penetrate the surface for 1-2 minutes, then wipe or rinse off with a clean, damp microfiber towel. Reapplication may be necessary depending on the severity of the stains.


  • Quickly removes mold and mildew stains on contact.
  • Blocks mold and mildew stains from reoccurring.
  • Does not contain bleach, leaves behind a fresh scent.
  • Works on all water-safe surfaces, including vinyl and fabrics.


Sale Unit: EA
Brand: 303 Products
Size: 16 oz

Shipping Restrictions

Flammable items can ONLY be shipped Ground to the 48 contiguous United States.


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Overall Rating : 4.2 5 Reviews

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Alan Kallas
Verified Purchase

Worked wonderfully

Charity Caley
Verified Purchase

Good stuff

Mary Koehler
Verified Purchase

A great cleaning product for boat canvas. Easy to use and does a great job of removing mold and mildew.

Cherry Carter
Verified Purchase

Product works great for removing mold and mildew from boat seats Thanks.

Derek Fairchild
Verified Purchase

Does not remove the mold and mildew.

Sailrite Response

Mold and mildew removal can prove to be stubborn. Sailrite has a blog on the subject that you may find helpful. (Link below) Pay attention to the cautions noted for using bleach and also to the comments on the blog, where there is some valuable advice and a link to another good article from Good Old Boat. It's definitely a process that is worth your time. Once under control, you will find the 303 product has a Blocker included that will prevent future problems. I hope this is helpful!

How to Remove Mold & Mildew From Fabric

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