There is also a drain tray below the evaporator coils by the heater core. It holds the run off from the A/C when it's running. It's a good idea to hit the "Rest" button once a week when you get out. It drys that tray out.

It's a catch 22 problem. You run the AC to get the fog off the window, but that puts condensation in the tray to fog the window up next time you get in the car. So hit the button on the way out. It works for me.

RB