Park your car into the stall, put some quarters into the machine, and try not to get wet. This is your basic coin op do it yourself place. It's much more efficient, and therefore cheaper, if you have a second person man the coinop and the dial. That way one person can clean and not have to go back to feeding the machine or changing the settings, thereby wasting time.
Triangle also has a drive thru wash. It costs about $3.