Where to wash coach while on road?

[astrungis]

If your lot is small and cannot accommodate the Montana (me). Or you HOA will give you static for parking it in the street in front of your house and washing it (me). Or if you are on the road for a couple of months and the campground does not allowed washing (could be me). Is your only option to take it to a RV dealer for a wash? How do you guys handle this. I'm a true DIYer and kills me not to do stuff like this myself and pay through the nose.