Thetford's Rubber Roof Cleaner & Conditioner is formulated as a cleaner and degreaser, with no abrasive components. The active ingredients remove oxidation, bird droppings, and dirt buildups. The cleaning process is done in three easy steps: - Step 1: Sweep the loose dust off the RV roof. Begin from the front and work your way towards the ladder. - Step 2: Spray Rubber Roof Cleaner & Conditioner on a 2 to 3 sq. ft. section of the roof and use a sponge mop to activate the cleaner and loosen dirt and chalk. Use a soft bristle brush if needed and work it in a circular motion - Step 3: Rinse cleaned section and allow the roof to air dry before walking on it. Note: Always use a sponge or rag to carefully clean the residue running from the roof, as the EPDM will create white streaks on the sides of your RV.