Believe it or not, we were told (since it had been sitting on a lot for years before we got it) to use cleanser on it, then wax it. The wax prevents that white "stuff" from dripping all over your coach after you've washed it. We won't use cleanser next time but will simply wash it the way we wash the rest of our coach, then apply wax. I say we, but I think I have hubby convinced to hire that out rather than crawl around on the roof of the land yacht.