Actually, this is a really nice car wash! Super affordable (the most deluxe version is just $13). You can either pay inside, or at the kiosk when entering the wash.

The machine takes its time to wash your car, but that can kind of be a bummer if you're the 3rd+ car in line. I'd say skip it and come back some other time if there are more than 2-3 cars, otherwise it's easily a 20-30 min wait.