Patio Black Spot Remover is unlike any other product on the current market as it is the only product that can remove black spots from your garden stonework with almost instant results. It will not only remove the black spots but ALSO remove white fungi spots and restores your stonework, giving it that ‘just been laid’ look. PBSR has been on the market for over 10 years. Not once have we met a patio we're unable to remove the spots from. We use our products every day and know how to get the best results.