I like Sam's the most because there are several locations popping up around Charlotte and they offer free vacuum service . The pricing I feel is reasonable too for reliable equipment ( I've had bad experiences at gas station car washes) .
This is the type of place you put your car in neutral and let the business do the rest . You can go inside and wait, but I've never taken that option. After you come out of the wash, you are able to vacuum your car yourself using hoses that are constantly running.