What to Do When the Outside of Car Windows Fogs Up?
2 Answers
Here are the solutions for fogging on the outside of car windows: 1. Open windows for air circulation: If the fog inside the car is not heavy, you can open the windows slightly to allow air exchange between the inside and outside of the car. This reduces the temperature difference and gradually eliminates the fog. This method works similarly to using the air conditioner to blow cold air but without increasing fuel consumption. However, the downside of opening windows is obvious—it’s not suitable during rain, snow, on highways, or when the fog is heavy. Additionally, it lowers the temperature inside the car. 2. Use the air conditioning system: For most car owners, using the air conditioning system to defog is the most common method. Almost all cars have air vents located under the front windshield. Simply adjust the air conditioning to the appropriate setting to use the airflow to clear 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 for most situations. 3. Anti-fog products: In many markets and auto parts stores, there are stalls selling specialized anti-fog products, such as anti-fog sprays or fog-resistant towels. Spraying these products onto the inner surface of the car window and wiping them clean not only removes dirt but also forms a thin, transparent protective film on the glass. This film prevents water vapor from condensing into fog on the glass. One application can last for about ten days to half a month.
I drive to and from work, and it's common to encounter fogging on the outside glass, especially in the early morning or on rainy days. The main cause of fogging is the large temperature difference, causing water vapor to condense on the cold glass. The quickest solution is to use the wipers directly, and driving at a higher speed makes it more effective. If the wipers aren't doing the job, turn on the air conditioning in external circulation mode, set the fan to maximum to blow on the glass, or crack the windows slightly to ventilate and balance the temperature—this will make the fog disappear. For prevention, wipe the glass clean with a dry cloth when parking to avoid dust attracting moisture, and regularly check the wiper blades for wear and replace them in time. Safe driving cannot be overlooked; if the fog isn't cleared, it's better to leave a bit later—driving with obscured vision poses high risks. Make it a habit to check the weather and glass conditions to avoid trouble and ensure safety.
