MMR Mold and Mildew stain remover is a Professional-grade instant mold and mildew stain remover, formulated to quickly and effectively remove mold and mildew stains on wood, concrete, drywall, cinder block, fiber cement siding, vinyl siding, composite decking and other porous surfaces. MMR Mold and Mildew stain remover penetrates soiled areas instantly, leaving surfaces clean and free from mold and mildew stains. MMR eliminates the need to sand, scrub, media blast, abrade or encapsulate surfaces (for the purpose of stain removal). Its the fast and easy way to eradicate mold and mildew stains. Take a tip from the Pros and use MMR to save time and money on mold and mildew stain removal.