Nearly all of these automated car wash places recycle their waste water and use it again by pumping heaps of chemicals in to it to get it up to scratch. :o I know of a couple of these places in Qld that have signs up saying that if you have a red or dark coloured car don't wash it here. Being that I'm a detailer I've seen first hand what this chemical polluted water does to pain and it literally etches the shine off the paint work. As for the ones who have some gumbies with a sponge to wash your car down... no thanks. I've seen them drop the sponge on the ground in dirty polluted, muddy water then pick it up and resume washing without so much as a rinse of the sponge.
The only sponge or cleaning product that touches my car is attached to my hand then i know it ain't going to do any damage. ;)