Can I use The O2 Algae and Mold System on vinyl or exterior trim?
No, The O2 System can only be used on porous or semi-porous surfaces, surfaces such as wood; concrete; brick; brick pavers; asphalt shingles; and stucco. Unfortunately, vinyl siding is a non-porous, smooth material, so OxiShield Algae and Mold Barrier will not adhere properly to vinyl siding. You can however, use Step 1, OxiOut Algae and Mold Remover to clean the vinyl siding or exterior trim, just follow the label directions. You will find that OxiOut Algae and Mold Remover is an excellent cleaner for these surfaces.