Treat them with 303 protectant every three or four month. 303® Products are the leading line of premium protectants and cleaners on the market today
I buy mine on line by the gallon, at either Ebay or Amazon. Normally get the best price on ebay with free shipping. Don't use any wax on them that contain petroleum distillates, abrasives or cleaner waxes. Got that info from Steve at RV Stripes & Graphics in AZ.
RV Stripes & Graphics
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129