Check the listing for details. 303 MOLD & MILDEW CLEANER & BLOCKER 32 FL OZ. Condition: New, Made in United States. Listed at 21.25 USD. The 303 Mold & Mildew Cleaner & Blocker is a 32 fl oz solution specifically designed to eliminate mold and mildew from various surfaces. With the brand's reputation for quality products, this cleaner and blocker is a reliable option for maintaining a clean and hygienic environment. Made with powerful ingredients, this cleaner effectively removes mold and mildew, while also providing a barrier to prevent future growth. Perfect for use in areas such as the bathroom, kitchen, or any space prone to moisture and mold growth.