Looks like the previous link I posted may have been slightly off on the steps. According to this one,
http://www.ehow.com/how_6491945_clea...a-corolla.html, here are the steps to reset the light.
- Turn your ignition on to view the odometer. Press your "Trip" stem until the display shows "Odo," instead of "Trip A" or "Trip B."
- Turn the ignition off. Press and hold the "Trip" stem. Turn the ignition back on, while continuing to hold the "Trip" stem.
- Wait until the odometer shows "000000." This lets you know that the maintenance light is reset. Release the "Trip" stem and remove the key.
Edit to Add: If the light doesn't go out after the reset its possible that something else is tripping the maintenance light.