How to Defog Side Windows?
4 Answers
First, turn on the car's air conditioning and adjust it to the hot air position. Then, activate the external circulation mode and direct the air vents toward the front windshield to blow hot air directly onto it. Spray some defogging agent or apply soap to the inner side of the glass. This can temporarily prevent fogging in that area.
Having driven for over a decade, I usually use the air conditioning to defog the side windows. First, press the fan-shaped defogger button, then lower the AC temperature and increase the fan speed—cold air blowing directly on the glass clears the fog quickly. I always keep anti-fog spray in the car; after washing, I spray it on the interior and wipe evenly with a soft cloth, which lasts for days. If fog suddenly appears, cracking the window slightly for airflow also helps. During rainy seasons, avoid leaving wet umbrellas or shoes inside—choose waterproof floor mats, as these details can reduce fogging significantly. Also, check if the window seals are worn, as poor sealing lets moisture seep in easily.
Using air conditioning for defogging in summer is super convenient. Just press the fan-shaped defogging button on the center console, and the cold air will clear the windshield in half a minute. In winter, be careful not to turn on the heater immediately, as the temperature difference can make the fog worse. I usually turn on the AC first to disperse the fog before switching to the heater. Keep a chamois cloth in the car for quick wiping in case of fogging. The heated rearview mirror function can also help with the side windows, but remember to use the external circulation mode to bring in dry air. Also, avoid leaving wet towels or drink bottles in the car, as evaporating moisture is the easiest way to fog up the windows.
Defogging requires the right approach. Using the AC is the easiest method: press the defog button, turn on the AC switch, set the temperature around 22°C, and direct the airflow toward the side windows. For sudden fogging, a mixture of dish soap and water wiped on the inner side of the glass works well and costs less than half a dollar. For long-term prevention, applying anti-fog film or using professional anti-fog spray monthly is effective. If using the heater to defog while driving, it takes about five minutes to work, unlike cold air which provides instant results. Remember to shake off wet umbrellas before entering the car on rainy days and store wet shoes in the trunk—these small habits can save a lot of defogging hassle.
