We have two full service car washes and 3 automatics in our small city. I mostly use one of the full service car washes at least a half a dozen times a year.
Up until the time I encountered this post, I have never given the matter any thought. As a coincidence to your post, yesterday, I was trapped in the middle of an automatic car wash for over 20 minutes, due to an equipment breakdown. It just didn't dawn on me that I was in any danger from anything other than being late for lunch.
I'll be ready next time tho! Next time, instead of tipping the guy in the wipe down area, I'll just come out blasting!!!
NOT!!!