how to defog car windows fast

To defog car windows quickly, turn on your defroster, set the fan to high, turn on the air conditioning, and ensure the recirculation mode is turned off.

Use the Defrost Setting. Set your climate control to the windshield defrost mode and turn the fan to its highest setting to direct dry air at the glass.
Activate Air Conditioning. Turn on the A/C, even in winter, as it acts as a dehumidifier to pull moisture out of the cabin air.
Disable Recirculation. Turn off the recirculation button to bring in fresh, drier air from outside, which helps clear the fog faster than recycling humid cabin air.
Address Exterior Fog. If the fog is on the outside of the windshield, use your wipers and set the temperature to a moderate level to warm the glass slightly.