You must not travel much if you only have to clean your coach 4 times per year. I have washed my coach and then had it rain during the next days drive (often). I full time and that makes my experiences very different than the majority of RVers but I still stand by washing with water and waxing with wax. Please understand that I do not dismiss the fact that the procedures listed by the previous poster is a workable solution for each of their individual situations. I can only try to convey the information that relates to my particular situation.