I just bought a Trail Lite B+ 211s with 8.1 Chevy engine. This is my fifth motorhome (others range from an old 20' Vagabond, and three Winnegagos, from 19 to 32'. This vehicle is fantastic. I am...
I've used lacquer thinner to clean dicor and to clean the roof in prep for Eternabond. It seemed to not harm anything. I take it the key point is to not saturate the roof with any of those types of cleaners.
From first hand experience, I can tell you to NOT use the degreaser type products on the roof.