The 303 Mold & Mildew Cleaner Blocker can be used to remove the toughest mold and mildew stains on your spa cover and hot tub. On top of this, it not only provides ultimate cleanliness, but protects the spa cover and spa pillows from future mold and mildew stains.

This is the 16oz bottle of 303 Mold & Mildew Cleaner Blocker.