Product Description A Fast Acting Professional Grade Roof Cleaner for Concrete, Slate & Terracotta Roof Tiles Roof Clean Xtreme is used by many roof cleaning professionals to clean roofs without the need for pressure washing. The formulation is a fast acting, high performance roof cleaning product that makes cleaning roof tiles easier than ever before. Once applied, Roof Clean Xtreme can quickly remove most types of organic growth from roof tiles that have become covered in algae and ingrained dirt over time. Furthermore, this roof tile cleaner will work on clay, slate, terracotta and concrete tiles without risking damage to the roof. To achieve the best roof cleaning results, just dilute the roof cleaning product 1:1 and use a watering can or sprayer to apply.