[Car Knowledge] Tips and Principles for Anti-fogging Car Glass

1. Principle Description

The fogging of car glass is mainly caused by the temperature difference between inside and outside, which causes water vapor to condense on the glass surface.

• When cold air meets warm and humid air , the temperature of the glass surface is lower than the dew point of the air, and water vapor condenses into small water droplets, forming fog.

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2. Anti-fog tips

1. Start the defog function (blow the wind from the front)

• Turn on the air conditioner or heater (A/C), select the "front windshield defog" mode, and direct the air toward the windshield.
• The cooling mode can effectively dehumidify and quickly eliminate fog.
• Heating is also available but is slower in effect.

2. Open the car windows for ventilation

• When it's drier outside than inside your car, open the windows slightly to allow moisture to escape.

3. Use anti-fog agent

• Commercially available anti-fog sprays can be applied to the inside of the glass to form an anti-fog film to reduce fog adhesion.

4. Homemade anti-fog method

• Soapy water/shampoo : Apply a small amount of soapy water or shampoo to the inside of the glass and wipe it clean with a dry cloth, which will leave a thin anti-fog film.
• Shaving foam : Apply evenly and wipe dry, it also has an anti-fog effect.

5. Wipe with dry cloth

• Prepare a clean, soft cloth (suede cloth, glasses cloth, etc.) in your car to wipe off fog at any time.

6. Keep the car dry

• Do not hang wet clothes or umbrellas in the car.
• Clean up water in the car regularly and keep the floor mats dry.

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3. Other matters needing attention

• Do not wipe the glass with your hands : it is easy to leave oil stains and fingerprints, and it will be more prone to fogging in the future.
• Keep the glass clean : Cleaning the glass regularly can help reduce fogging.
• Check the air conditioning filter regularly : if it is too dirty, it will reduce the dehumidification effect.

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4. Quick Lookup Table

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