How to Defog Your Car in Winter?

[StephenAnn]

Here are some ways to defog your car in winter: 1. If the speed is not too fast, you can use air convection: Open a small gap in the car window to allow air convection between the inside and outside of the car. After a while, the fog on the inner glass will dissipate. 2. Use a car-specific anti-fog spray: Before using the anti-fog spray, first clean the inside of the front windshield, then spray an appropriate amount of the anti-fog spray. After the spray solidifies, wipe it clean with a clean towel. The anti-fog spray forms a water-repellent layer between water molecules and the inner surface of the glass, keeping the glass surface clean and preventing fogging. 3. Use the air conditioning's cooling and dehumidifying function to reduce air humidity and remove fog: In summer, especially when multiple people enter the car and the air conditioning is not turned on in time, the humidity from exhaled breath can quickly cause the front windshield to fog up. In this case, turn on the air conditioning to blow cold air toward the front windshield. Using the dehumidifying function of the air conditioning, the fog on the front windshield can be removed quickly.

[MacAaliyah]

Dealing with foggy windows in winter can be quite annoying. Here's my usual approach: When you first get in the car, don't rush to turn on the heater. Instead, blast the air conditioning's cold air directly at the windshield for about 30 seconds—the fog will clear up instantly. After driving for a few minutes and the engine warms up, you can switch to the heater. This way, you'll defog the windows without freezing. If you prefer not to use the AC, cracking open the sunroof or side windows can also help by improving air circulation inside the car. Remember to use a microfiber cloth when wiping the glass to avoid water streaks. I also apply an anti-fog spray every time after washing my car to prevent sudden fogging and avoid last-minute panic.

[JackLee]

Defogging actually relies on reducing temperature differences and humidity. In the morning when I start the car, I usually turn on the external air circulation to quickly balance the humidity inside and outside the vehicle. Before the engine warms up, avoid setting the temperature too high or the fan speed too strong, as this can actually worsen fogging. Keep the rear window defroster on regularly, and use the wipers to maintain rear visibility. If the windshield is frozen, never pour hot water on it—it can crack! I always keep an ice scraper handy to gently remove the ice. Avoid leaving wet umbrellas or melted snow inside the car, as lower humidity significantly reduces the chance of fogging.

[Paula]

Why bother when a 3-second press of the defog button solves it automatically? My car's automatic AC directly selects defog mode, optimizing both airflow and temperature. If you're afraid of cold, just use the mobile app to start the car remotely in advance—it'll be warm and fog-free when you get in. If the factory features aren't enough, buy anti-fog film and apply it to the inner side of the glass like a phone privacy screen. Remember to replace the AC filter regularly, or the airflow will smell musty and fail to dehumidify. Don’t breathe on the glass and wipe it—that just makes the fog worse.

[DiAaliyah]

Experienced drivers in -20°C regions recommend turning on seat heaters first before defogging, as warmth improves patience while waiting for the fog to clear. Set the warm air to blow simultaneously at the feet and windshield, allowing heat to rise naturally. Keep the external circulation on during rain or snow—it makes wiper operation smoother. I always keep defogging wipes in the glovebox for quick emergency use at traffic lights. Leaving a slight window gap when parked prevents overnight fogging, but be mindful of security. Ensure antifreeze windshield fluid is topped up—strong cleaning power ensures clear visibility.