I would....think of it as a treat! They'll do a even better job for you next time. Heck, I even tip the kids at the fast food joints....they NEVER get tips! Oh, and I've tipped gas station attendants, too. One time, during a cold snap, I picked up apple-cider donuts on my way to work...they were still warm. I gave one to each of the attendants at a gas station...from that point on, I got my windshields washed!!! :mrgreen: