We use Quick n Brite to clean the rubber roof as well as the exterior of the RV. We bought our Quick n Brite at a rally years ago and have been using it since. It works better than our previous products in every area of the RV we have tested it on. We joke with our friends we should be representatives because we love our Quick n Brite so much. Easiest thing we have found to clean the roof and exterior is to dilute the Quick n Brite in a bug sprayer and spray down the motorhome then come back with a pole brush and the remaining solution to scrub the exterior down. Giving it a few extra minutes to sit really helps get all the bugs and black streaks off with less scrubbing. We do the same thing on the roof. Spray it down then come back and brush it in, then rinse with a garden hose. It does not dry out or crack the rubber roof. Been satisfied with the product since our first time trying it.