To clear fog inside the windshield, follow these steps: 1) Activate the front defogger or direct airflow to the windshield vents. 2) Turn on the air conditioner, even in winter, as it dries the air. 3) Increase the temperature to warm the air, as warm, dry air clears fog faster. 4) Turn off the recirculation mode to allow fresh air to enter the cabin. 5) If the fog persists, crack open a window briefly to balance the humidity. Avoid wiping the glass with your hand, as it leaves streaks and worsens visibility.