A high-performance black spot remover for cleaning black spot, lichen and mould from block paving, concrete paving slabs and natural stone patios. *Not recommended for use on Tarmac*Xtreme Black Spot Remover is a fast acting, high performance patio cleaning product, with four powerful active ingredients. Xtreme Black Spot Remover offers the simple way to keep any patio clean often avoiding the need for pressure washing. For best results do not dilute; apply in temperatures between 5° - 20° C It is important that the patio remains wet for 1 hour. Then wash away with water from hose or pressure washer. For areas of heavy soiling, scrub into surface or re-apply. Xtreme Black Spot Remover is a powerful cleaning product, which cleans & helps to slow down future contamination.