How to Deal with Fogging on the Outside of the Windshield?
2 Answers
Solutions for fogging on the outside of the windshield are as follows: 1. Open windows for air circulation: If the fog inside the car is not heavy, you can open the windows slightly on both sides to allow air to circulate between the inside and outside of the car. This reduces the temperature difference and gradually eliminates the fog. The principle is similar to using the air conditioner to blow cold air, but this method does not increase fuel consumption. However, the downside of opening windows is obvious—it is not suitable during rain, snow, high-speed driving, or heavy fog, and it also lowers the temperature inside the car. 2. Air conditioning system: For most car owners, using the air conditioning system to defog is the most common method. Almost all cars today have air vents located under the front windshield. Simply adjust the air conditioning to the appropriate setting to blow air and remove the fog. But should you use cold or warm air? Both have their pros and cons. If you're in a hurry, cold air can serve as an emergency solution. However, warm air is generally recommended in most cases. 3. Anti-fog spray: In many markets and auto parts stores, you can find stalls selling specialized anti-fog products, such as anti-fog sprays or fog-resistant towels. Spray these products onto the inner surface of the car windshield and wipe them clean. Besides removing dirt from the glass, they also form a thin, transparent protective film that prevents moisture from condensing into fog. One application can last for about ten days to half a month.
I often encounter fogging on the outside of the windshield, especially on rainy days or right after washing the car. From my experience, adjusting the direction of the air conditioning vents works best—avoid blowing cold air directly onto the glass. The fog is caused by the temperature difference between the cold air inside the car and the warm air outside. Turning on the wipers for a couple of swipes clears it instantly while also removing rainwater. Wiper blades should be replaced regularly, as aged rubber won’t wipe cleanly. In humid weather, try switching the AC to external circulation or slightly opening the windows to improve airflow. Wiping the edges of the windows with a soft cloth before driving can also prevent fogging. As a last resort, keep a bottle of anti-fog spray handy—one application can last up to two weeks. These little tricks are practical and cost-effective, gathered bit by bit over time.
