Lot of chance to get dirty again unless the roads are dry.
I didn't realize that car washes still had people working there, any I've seen in the last 10-15 years have been totally automated...pay with a CC and drive thru. There's usually a phone # to call if there are problems.
Curiously, what do you use to lube the door weatherstripping so they don't freeze? Nothing I've ever tried worked.
Southern cars have always sold for a premium here for that very reason. There are car lots that specialize in them...they'll send a carrier to an auction down south and come back with a load.
Of course, they may or may not be in any better mechanical condition, but at least they're not usually rusted out. You've just got to beware after a flood or hurricane that you don't get something that got wet.