The self-serve bays only need $2 to start with cash quarters, or you can conveniently use a debit or credit card; minimum charge is $3. Wash how you like or follow the wash instructions on the wall for the best outcome. When you're done, turn the dial to "Stop", and if you used a card, be sure to press the flashing red button to complete your transaction. Max charge: $10 per swipe. Debit card users will see a temporary $10 hold until the transaction settles.