Nick Maclaren wrote:

I never clean cars, except to sell them, and I haven't done that in
decades. Why should one bother with anything except the windows,
lights etc.?

Because if you don't, small scratches from road detritus may go
unnoticed, and cause rust patches that ultimately destroy the car.

Assuming it's got any metal parts, that is.
--
Carol
"If you are allergic to a thing, it is best not to put
that thing in your mouth. Particularly if the thing is
cats." - Lemony Snicket _The Wide Window_