There is water mist under the headlights of the car. What is this?

That's the headlight cleaning device, one on the left and the other on the right. There is a button on the center console. After pressing, the nozzle extends out of the box to clean the headlights. Most of these devices are equipped in mid-to high-end cars, and many countries have taken this device as a necessary device for cars.

Extended data:

1, headlight cleaning device means that there is a water outlet below the headlight, which can clean the dust and dirt of the headlight at any time. Generally, some advanced models have this function.

2. Function: When the car is driving at night or in dim light, rain and dust will reduce the illuminance of headlights by 90%, which seriously affects the driver's sight and has great hidden dangers to driving safety. It is an important problem to ensure adequate lighting of the headlights and give the driver a clear line of sight.

Baidu Encyclopedia "Headlight Cleaning Device"