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Use to remove algae and blackspot (a type of lichen) that often thrive in damp and shaded areas. This is a powerful and easy to use treatment that breaks down and eliminates algae & blackspot growing on walls, patios, decking, fences, roofs, paths, driveways, garden containers and planters. Simply spray on and leave for 24 hours, no scrubbing required. Provides long lasting protection against re-growth.