Use the app in the self-serve bays.

Step 1. Open the Willie’s Car Wash app and tap Buy Single Wash.

Step 2. Tap Check In.

Step 3. Confirm your location by tapping Yes.

Step 4. Select Self Service Car Wash.

Step 5. Fill in your card information if needed, then tap Buy.

Step 6. Tap Scan QR Code and scan the code posted in the bay.