How to Deal with Fogging on the Outside of the Car Windshield?
2 Answers
Solutions for fogging on the outside of the car windshield are as follows: 1. Air Conditioning Defogging. This is the simplest and most effective method. Simply turn on the front window defogging mode, set the fan speed to maximum, turn on the A/C switch, and adjust the temperature to the lowest setting to remove fog. Additionally, some models are equipped with electric heating for the rear windshield and side mirrors, which can eliminate fog in about a minute by pressing the switch. 2. Air Convection Defogging. Opening the windows increases air convection, reduces the temperature difference between the inside and outside of the car, and weakens the conditions for fog formation. This method is relatively economical but suitable for fewer situations. 3. Defogging Spray. The best method is prevention by using a defogging spray in advance. Its principle involves using surfactants to leave a protective film on the glass surface, altering the surface tension of water molecules, causing fog droplets to coalesce into larger droplets that do not obstruct vision. 4. Homemade Defogging Spray with Dish Soap. If a defogging spray is not available, you can mix dish soap with water in a 1:6 ratio, put it in a bottle, and spray and wipe it before traveling. The effect is comparable to a defogging spray, but the durability is slightly worse.
I've been driving for over a decade. Fogging on the outside of the windshield commonly occurs in winter or rainy days because the low external temperature causes moisture in the air to condense on the glass, which is quite dangerous as it blocks visibility. I recommend immediately turning on the defrost function (that's the defog button in the car), which combines with the fan to dry the air. At the same time, activate the wipers to clear the fog, but remember to clean the wipers regularly to prevent smearing. Turning on the AC mode can quickly dehumidify, and switching to external circulation to let fresh air in is even better. Prevention is key: simply wipe the glass or spray anti-fog agent to prevent condensation after parking. Remember not to use hot air directly as it may worsen the fog. Safety first—if you encounter heavy fog, pull over to deal with it before continuing to drive.
