We just finished a three week trip from TN to CA taking very northern route (TN, AR, MO, NE, ND, MT, UT, NV, to CA). I had the coach washed and waxed in Las Vegas and it looks new again.
We went through 3 or 4 rain storms which does seen to clean the coach off except for the part from the rear wheels back.
I clean the whole front end at every evening stop (from top to bottom). If I didn't, I wouldn't be able to see out the window after 3 days!
When I can, I will wash it myself which takes about 2.5 hrs. which includes washing the roof and putting 303 Protectant on the tires. I like a clean coach.
MM.