How does the carwash know which car ordered which service?

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When I’m in a multiple lane carwash and we all have to merge into line, how does the carwash differentiate the cars and their ordered service?

In: 2

All the ones I go to either write something on the windshield in washable ink, or the automated ones base it solely on order in which it was purchased.

I believe the automated ones use license plate readers to match purchase with settings in car wash.