BioGuard Off The Wall Surface Cleaner allows you to efficiently remove the most stubborn scale, dirt, and stains on most types of pool and spa surfaces including plastic, vinyl, fiberglass, ceramic and painted surfaces. Do not use this product on copper, brass, marble, stainless steel, aluminum or galvanized surfaces. This product is specifically formulated for compatibility with swimming pool and spa water. Off The Wall Surface Cleaner is designed to be a long-lasting cleaner, so fewer re-applications are needed.