How to Defog the Front Windshield of a Car?
2 Answers
Methods to defog the front windshield of a car: 1. Wipe off the fog with a towel: However, if you choose to wipe off the fog with a towel, it can only be done when the vehicle is stationary. It is not safe to wipe the windshield while driving, as it can distract the driver. 2. Open windows for air circulation to remove fog: If the fog is not too heavy, you can slightly open the windows on both sides to allow air to circulate inside the car. As the interior temperature gradually matches the outside temperature, the fog will dissipate. 3. Use the air conditioning system to defog: During autumn, winter, or rainy days when the windshield fogs up, you can utilize the air conditioning system to remove the fog. 4. Use a defogging spray: Defogging sprays can be purchased at auto parts stores or online. Spray the defogging agent onto the inner surface of the windshield and wipe it clean. This not only cleans the glass but also forms a thin transparent protective film that prevents moisture from condensing on the glass and forming fog. One application of the defogging spray can prevent fogging for about ten days.
Defogging is actually quite important, especially when driving during the rainy season or in winter, as fogged-up windows can severely obstruct visibility and be very dangerous. Let me share my approach: After starting the car, I immediately turn on the air conditioning, set it to cold air mode, and press the front window defogging button (the one with the fan-shaped arrow icon). Blowing cold air from the AC quickly condenses the moisture inside and outside the window, usually clearing the fog within a minute or two. If the fog is heavy, I turn on the external air circulation to let dry air in and slightly increase the fan speed—but avoid directing it straight at the face. Also, don’t forget to check the humidity inside the car; reduce exhaled moisture by avoiding drinking hot water or carrying wet items while driving. Sometimes, I keep a towel handy to wipe the windows manually in emergencies, but for long-term safety, relying on the car’s systems is better. Safety comes first—ensure clear visibility before hitting the road, and never try to handle fogged-up windows while driving.
