Moldex Deep Stain Remover is a concentrated multi-surface cleaner that?s packed with Oxygen-Power for the removal of deeply seated mold and mildew stains. The Hose End Sprayer is perfect for roofs, siding, shingles, concrete, foundations, brick, masonry, walkways, patio furniture, fabric, vinyl and more. When applied properly, it also leaves behind a residual stain fighting technology on the surface that lasts for months.