Product Description Powerful and Effective Patio Cleaner Remove black spot from block paving, concrete or natural stone on patios. *Not recommended for use on Tarmac* PatioClean Xtreme is a fast acting, high performance patio cleaning product, with four powerful active ingredients. PatioClean Xtreme offers the simple way to keep any patio clean often avoiding the need for pressure washing. Simply dilute 1:1 and apply to a wet surface by watering can or sprayer. 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. PatioClean Xtreme is a powerful cleaning product, which cleans & helps to slow down future contamination.