it is when you purchase your car wash. I think they also take a photo of your plate. and they match it up as you enter the wash
Hello Arthur, when you purchase a wash at our gate, after the gate opens you will be placed in a queue. As you pull in, their is a computer screen next to the attendant loading you in. If you pay with card, your name and a picture of your car will pop up. If you pay with cash, just the picture will show up. So as long as no one skips in line without any attendants noticing you will always receive the wash you purchased. There is also a sign on the right side of the tunnel after you enter that will light up with the wash you had purchased.
It's determined by placement as you pass through the payment gates.
I know they put an id sticker on your windshield to id the car as you drive through
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