Traveled the Top of the World highway recently between Chicken, AK and Dawson City, Yukon. Lots of dirt/dust was on the motorhome, and when we washed it the sides of the motorhome are stained a dirt color. Motorhome is a 2002 Winnebago without a gel coat paint job.
Has anyone else had a problem like this and how did you get the staining off?

Thanks,

Bob