“The weather was getting cold, and it was raining the next few days. It was hot and cold. The front windshield was fogging. I panicked.” Miss Guo, who lives in Jiaojiang, just bought a car, and she still had to drive to the bridge to work every day. In the face of this old problem that seriously affects the safety of traffic, she has no choice. "I had to open the cold air-conditioning and blow it against the glass. But when it's cold, it's cold air-conditioning. I'm cold, so I can't help it."

The reporter learned that the cause of fog in the windows is “internal heat and cold”. When the temperature difference between the inside and outside of the vehicle is large, the water vapor exhaled by the occupants of the vehicle will condense into water vapor when it encounters cold glass. This is an old problem, but it is not a small problem. Once the sight line of traffic is blocked, accidents may occur within a few seconds. Therefore, it is necessary to remove fog in cold and rainy days.

The day before yesterday, the reporter interviewed Mr. Han, who had a five-year driving experience, Mr. Lin, coach of Wanli Steamship School, and Mr. Su, a teacher of Shunfeng Auto Repair Shop, and summed up three methods with higher usage rates for comparison.

The most primitive way: wipe with a dry cloth or paper towel

Advantages: immediate results

Disadvantages: laborious, unsafe, leaving traces after rubbing

The most primitive method is to wipe the glass directly with a dry cloth. This kind of scene must have been seen by many citizens: The old drivers always keep a towel, and when they stop at the red light, they wipe the glass. The disadvantage of this method is that it is relatively laborious. After the wiping, the glass will leave traces, and it will fog again very soon. If you wipe while driving, you can easily cause an accident. User Uranus1126 said that on the first rainy day after his car was picked up, the driver’s seat was the way he used to help the driver’s wife wipe the glass. “It can be scraped with another car.”

The most convenient way: blowing with hot air

Advantages: no distraction

Disadvantages: Slow start, the rest of the window still fog

The second method is to blow directly with hot air. However, this method is relatively slow, and the fog on the front glass is getting bigger and bigger when the vehicle is just opening the hot air. It takes only 10 minutes for the glass to become clear. The netizen “Inside the Park” recommends that the hot air be turned on immediately after the hot car. At the beginning, it should be blown with “high temperature” above 25°C. After the fog disappears, the temperature is slowly lowered to about 22°C.

The most creative way: detergent with a dry cloth

Advantages: good preventive effect

Disadvantages: To deal with in advance

The owner of the car, Mr Han, is willing to accept new things. On the issue of “dust removal from the cold,” he collected a lot of materials on the Internet and tested the “cleaning detergent with a dry cloth” method. The effect was not bad. Choose a sunny day, use the kitchen detergent to dilute the water (1:6 or so), use a sponge evenly coated on the glass in the car, etc. After the dry, wipe with a dry cloth, do not leave traces. In general, the effect lasts for half a month.

After sales staff Huang Baohua told reporters that this method is feasible, because detergent contains surfactant, which can change the surface tension of water, so that the droplets quickly condense into large droplets, can play anti-fog effect. "However, this is a preventive measure and must be handled in advance. If we wait until we find out that we can find fog again, it will be too late," Huang Baohua said.