How to Deal with Fog on Car Windows?
2 Answers
Here are the methods to handle fog on car windows: 1. Preventive measures such as spraying anti-fog agents. Spray a small amount of defogger on the car windows (inner side) and wipe it clean to remove dirt and stains. While polishing the glass, it forms a thin transparent protective film that effectively prevents moisture from condensing into fog on the glass, especially suitable for cold winters. Alternatives to anti-fog agents include dishwashing liquid, soapy water, glycerin, alcohol, or saline solution. After drying, use chamois or a soft dry cloth to wipe off excess fibers, ensuring the car windows remain fog-free for several days. 2. Air conditioning cooling method. Use the air conditioning's dehumidification function to reduce air humidity and remove fog. In summer, especially when multiple people enter the car, if the air conditioning is not turned on promptly, the high humidity from exhaled breath can quickly cause the windshield to fog up. At this point, turn on the air conditioning to blow cold air toward the windshield, utilizing its dehumidification function to remove fog quickly. If the humidity is too high and the air conditioning is ineffective, slightly open a window to rapidly reduce the humidity inside the cabin. Combining this with the air conditioning can yield faster results. 3. Air conditioning heating method. Use the method of reducing temperature differences to remove fog. In winter, direct warm air from the heater onto the glass to quickly raise the temperature of the front windshield, reducing the temperature difference between the inner and outer surfaces of the glass. This can prevent excessive fogging on the windshield, but note that the rear and side windows heat up more slowly, requiring more time to completely remove all fog. 4. Whether the air conditioning is automatic or manual, turning it on (i.e., the AC indicator on the screen) aids in dehumidification. Avoid setting the air conditioning temperature to the coldest position, as prolonged use can cause frost to form on the outer surface of the windshield.
Every time I encounter fog obstructing the windshield while driving, I simply turn on the air conditioning, set the temperature to the highest, maximize the fan speed, and direct the hot air towards the front windshield. The fog dissipates within two minutes. If the weather isn't cold, I also crack open the side window slightly to let fresh air in and dilute the moisture—a simple yet effective method. In winter, before driving, I like to spray some anti-fog agent on the inside of the glass or place a bamboo charcoal bag on the dashboard to absorb moisture, preventing humidity buildup after overnight parking. Fog forms mainly due to the temperature difference between the inside and outside of the car, where exhaled air condenses on the cold glass. Therefore, maintaining ventilation and dryness inside the car is key. Safety comes first when driving. If the fog is too thick to see the road ahead, I definitely pull over to deal with it before continuing—never take unnecessary risks.
