I used to use Dawn and Turtle Wax ICE and had great results, but since full-timing I've switch to a waterless wash and wax (called
Wash & Wax) and love it. It's quicker, gives a better shine and I can keep the rig looking good while on the road. The link above is for the gallon version, but it also comes in a
concentrated form. Amazon sells it and it has a 5 star rating with over 800 reviews. I recently used it on my truck, while in the dusty desert, and an individual came by and said my truck looks like it just came off the showroom floor.