Well, having the part time job at the car wash in the summer, I dry the cars outside and we have a tip box on our stand that holds the tire dressing and cleaning products.
The richest people that come in the newest S classes or 7 series or whatever DO NOT TIP!!!!!!!
A person that comes in a barely running old GM or Ford will tip.
It makes me frustrated the most when they ask you to scrub off something and do all this work and they leave with nothing in return and they KNOW that we have a tip box!