Welcome to the forums!
About the cleaning, first, get a big shovel...Just kidding (I hope). As far as chemicals to use and stay away from, there are several threads about what people use to clean their coaches. A forum search for "cleaning" should net you several threads' worth of stuff to use, and what to stay away from. In a nutshell, anything that reacts badly with aluminum is a no-no.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.