For what its worth:
"Proper care and maintenance of your recreational vehicle, including your EPDM roof, is important for trouble-free performance. Normal maintenance is simple, easy, and requires no special material.
1. Keep your roof clean. Clean your roof at least four (4) times annually.
For normal cleaning:
– Use Dicor Rubber Roof Cleaner RP-RC160C concentrate to clean complete roof or RP-RC320S ready to use cleaner in a spray bottle for smaller areas. (See CAUTION below.)
– Rinse complete roof with clean water to remove any loose dirt or debris.
– Using a medium bristle brush, along with the cleaner mixed with 2 or 3 gallons of water, scrub the entire roof. Rinse thoroughly with clean water to avoid residue build-up on the roof or sidewalls of the vehicle.
– For more difficult stains, you may use RP-RC160C in its original concentrated form. For stubborn stains, use a cloth dampened with mineral spirits. DO NOT use mineral spirits in a large area or allow it to soak into the membrane.
CAUTION: DO NOT use cleaners or conditioners containing petroleum solvents, harsh abrasives, or citric-based cleaners. You may cause irreparable damage to your roof and/or may void your warranty. Use caution when working on top of your vehicle. The wet membrane may be extremely slippery.
2. Beware of areas where fruit, tree sap, or harsh environmental fall-out may stay on the roof for an extended period of time. These conditions may result in irremovable stains. If you are in these conditions, you may have to increase the frequency of your cleaning."