I was actually witness to the worse example of washing a Camaro over the weekend...I attended a fairly large car show and someone pulled in with a IOM 5th gen Camaro, parked the car, and proceeded to take a jug of water out of his trunk, dampen a rag\chamois and proceeded to wipe down the back of the Camaro to remove all the dust that accumulated from his 2 hour road trip. HE continued to "wash" the complete car this way.
I couldnt believe what I was watching and my friend, who is a detailer, had to walk away before saying something to the guy.
I went by the car afterwards and you should have seem the swirl marks in the paint...some people just dont care I guess!