When I bought my 1992 RVan in 2011 it was heavily oxidized. I took it to a portering service for vehicles, aka detailing service. What they did was amazing altho not cheap.
We have a Blue Beacon nearby which would be much cheaper for a quick wash between the yearly cleanup, but when I called and asked they said they dont do vans. Anyone actually go to a Blue Beacon and get a wash?
I think this next year I am going to have one of those "come to the campground" services to clean it up once I get there and see how it compares.
I guess I wouldnt trust a bunch of high school kids with gritty rags doing swirlies on my van.