You get as many different answers as there are car washes!
So far, I have used the following:
XMT Gel Shampoo
Wolfgang Auto Bathe
Meguiar's Deep Crystal
CG Citrus Wash
CG Mr. Pink
All of them have done the job. I like the more concentrated washes as a little goes a long way. When I run out of one, I may try another based on what I read here. All depends on what you like.