Our ready-to-use path and patio cleaner cleans up to 33 square metres. This surface biocide is for amateur use against algae, mould and lichen. This non-acid based exterior hard surface cleaner can be used on a wide range of hard surfaces such as brick, tarmac, asphalt, block paving, concrete and stone. Unlike acid-based treatments, this formula uses chemicals to clean instead of corroding away the surface. It's specially formulated to remove a wide range of stains from exterior surfaces such as paths, driveways, patios and walls. Always read full packaging and directions before use. Warning: Keep out of reach of children. Keep in a safe place.