Surface treatment of RV's is much different than auto paint. If you have fiberglass siding, it is usually gelcoated which provides a smooth, polished surface. If you have aluminum siding, it is painted using a variety of single pass topcoats, one of which may be be clearcoat. An auto finish is primed, dipped and baked. The final topcoats are multiple clearcoats that are very scratch and stain resistant.
There are a lot of surface treatments out there, waxes, acrylic polymers, and various proprietary chemicals that will shed dirt and road debris. The trick is to build a treatment on the surface that is durable and smooth. Traditionally, this is done on clear-coated surfaces with waxes and a buffer, the buffer smoothes the wax and also tempers it. I know some folks swear by the Zep floor wax to attain a gloss finish for their RV. I've had good luck with Parfe liquid wax on some equipment and plan to put on a few coats on my newly painted aluminum, this summer.
Good luck with your cleaning efforts!