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What to Do If the Windshield Fogs Up Before Driving?

1 Answers

McTalia

07/29/25 3:49pm

Here are the methods to defog the windshield before driving: 1. Use a specialized defogging agent: There are dedicated defogging agents available in the automotive beauty market. Spray this agent on the inner surface of the car glass and wipe it clean. While removing dirt from the glass, it also forms a thin transparent protective film that effectively prevents the formation of fog caused by condensation. One application can prevent fogging for about 10 days. 2. Turn on the air conditioning while blowing warm air: According to the car manual, the method to defog is to adjust the air conditioning vents to the windshield position and turn on the air conditioning switch to activate the compressor for dehumidification. However, if the temperature control knob is set to the cold air position at this time, the passengers inside the car will feel very cold. Therefore, the temperature knob can be placed in the warm air position to achieve both defogging and warming. 3. If the fog inside the car is not heavy, you can open a small gap in the side windows to allow air convection between the inside and outside of the car, reducing the temperature difference and causing the fog to gradually disappear. The principle of this method is the same as turning on the air conditioning cold air, but it does not increase fuel consumption.

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