For top-down cleaning of your RV, start with the most effective cleaner and conditioner on the market - RV Rubber Roof Cleaner and Conditioner. Our formula cleans, conditions and protects at once. Removes oxidation, tree sap, bird droppings and other common stains. It features a UV blocker so roofs look better longer and a non-petrolium formula that's tested safe (petroleum-based formulas can cause swelling, cracking, or degradation of rubber surfaces). It removes tough stains from rubber, fiberglass and aluminum roofs.