DON'T TRUST ANY OTHER SELLER OF WET AND FORGET ON AMAZON. WE CAN'T GUARANTEE IT'S QUALITY. Wet & Forget has been around for 30 years! It is the original product of it's kind. It beats all other products hands down! Trusted by many famous landmarks. It is the Number ONE trusted product used by big organisations because it works! ie: The Sydney Opera house, Floridian Theme Parks. Wet and Forget has a unique combination of biodegradable selective surfactants for moss, mould and mildew stain removal on any exterior surface. When diluted with water and applied, it immediately penetrates the unsightly stain. Each time it rains, this safe, cleansing combination reactivates to gently lift the moss, mould and mildew stain without damaging the surface. Wet and Forget requires no scrubbing or rinsing. It is non-acidic, non-caustic and contains no bleach. Be patient, Wet and Forget's gentle cleaning action takes time depending on how heavy the stain is and results are visible over time. Remember good things take time, and Wet and Forget continues to clean for up to a year. No special equipment is required. Just apply Wet and Forget with a pump-up garden sprayer. After the first application simply reapply Wet and Forget at the first sign of moss, mould and mildew stains returning. Wet and Forget can be used on any outdoor surface. Some examples of these surfaces are: asphalt, astroturf, aluminium cladding, awnings, brick pavers, composite decking, concrete, driveways, wooden decks, fiberglass boats & upholstery, green houses, gutters & facias, limestone, marble, marinas, natural stone, outdoor furniture & upholstery, outdoor planters, paint surfaces, patios, campervans & caravans, tents, retaining walls, boat sails, shade sails, sandstone, sidewalks, stucco, tarmac, tennis courts, teak decks, textured finishes, tiles, tombstones, umbrellas (outdoor), vinyl siding, wood. Don't spread the problem by water blasting!