Sorry to hear about the break in. I read it on your other post. Call Galen, he'll hook you up with a nice DVR camera system. PM me if you don't have his number.
I agree with "This towel was stolen from xxx Car Wash". I was going to suggest just putting your car wash name on the towel, however, the other posting adds humor to it. If they are going to steal, they can at least advertise for you. Maybe people would make a game of it and see who all can "nab" one from you. Just think of all the people seeking your wash to get a great towel!