I've been looking for the best cleaner I can get for the outside of my travel trailer. My brother bought a TT this year and naturally they had an orientation and a demonstration of cleaning products. The delaer had about a dozen older TT models there. He told my brother to pick one for an exterior cleaning test. The dealer took whatever product he was trying to sell and SPRAYED it on the side of camper. What was once a tannish dingy color with blacks streaks became extremely clean with a couple swipes of the cloth...according to my brother. Anyone have any suggestions as to which product works the best??