How to Solve Fogging on the Outside of Car Windows on Rainy Days?

1 Answers
MatteoLee
07/29/25 4:57pm
Methods to deal with fogging on the rear glass after rain include using air conditioning for defogging, opening windows for convection defogging, anti-fog spray, anti-fog cloth, and detergent-based defogging. Specific introductions are as follows: Air Conditioning for Defogging: There are two main reasons for fogging on car windows: low temperature and high air humidity. Air conditioning can be used to remove fog from the front windshield, but if the humidity inside the car is too high, the effect may not be very noticeable. Slightly opening the windows can quickly reduce the humidity inside the car. Opening Windows for Convection Defogging: Opening windows allows cold and hot air to circulate. If the fog is not too heavy, you can open a small gap in the side windows to allow air convection inside the car. The temperature inside will gradually approach the outside temperature, and the fog will dissipate. The advantage is that it achieves the effect of turning on the air conditioning without increasing fuel consumption. During extreme cold or rainy weather, it is recommended to intermittently open and close the windows. This method is not suitable when the fogging is very severe. Anti-Fog Spray: Using glass anti-fog spray can form a transparent hydrophobic ion film on the glass surface, preventing water droplets and fog from condensing. Anti-Fog Cloth: When fogging occurs, wiping with an anti-fog cloth will prevent further fogging. The effect of an anti-fog cloth is the same as that of an anti-fog spray. Detergent-Based Defogging: Mix dishwashing liquid with water in a ratio of approximately 1:10. Then, use absorbent cotton or a clean, soft cloth to apply it to the inside of the front and rear windshields. Alternatively, you can mix household shampoo or shower gel with water in a ratio of about 1:10, pour it into a spray bottle, and spray it on the glass before driving to prevent fogging.
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