I just read the thread about how to get snow off of the car and it got me thinking. A few people mentioned going to the self serve carwash and rinsing/washing there. Sounds ok, however, even though it is brushless, what about the soap at those places? Does it strip wax? If so, maybe more harm is done since I'd rather have a dirty car which is covered with many layers of wax than a clean one with no wax at all. Any thoughts?