Turn on your car's defrost function to warm up the windshield and gradually eliminate fog.
If it's not too cold outside, open a window slightly to let in fresh, cold air.
Even in winter, using the air conditioning can help dehumidify the air inside your car, preventing fog formation on the windshield.
Keep your windshield clean to minimize the chance of fogging.
Apply a commercial anti-fog solution or make your own by mixing water with a small amount of dish soap or shaving cream.
Keep all windows clean, as fog can develop more easily on dirty surfaces. Wipe down side windows and rearview mirrors to maintain visibility.