How do I reset the/service light on my Audi A4?

I recently serviced my Audi A4 and the service light is still on. How can I reset it without going to the dealership?

To reset the service light on your Audi A4, first press and hold the clock button on the dashboard. While holding it, turn the key to the 'on' position. Release the button and then use the up and down arrows to set the clock to 1:00. Press the clock button again and the service light should reset. This trick works on most Audi models.