What is the oil film on the car's front windshield?

[TannerAnn]

It may be caused by dust or other substances in the air remaining in the pores, which gradually form an oil film. The following is a related introduction about car windshields: Precautions: The windshield must be replaced correctly. To prevent wind and water leakage, do not wash the car for three days, and remove the tape fixing the windshield position after three days. Drive smoothly and avoid emergency braking and sudden acceleration. Function: The reflection of passengers inside the car through the front windshield is imaged above the front of the car, while pedestrians on the road are in front of the car, allowing the driver to distinguish between passengers inside the car and pedestrians on the road. The car's windshield is placed vertically, like a large flat mirror, which will image the passengers inside the car in front of the car, hindering the driver's ability to see pedestrians on the road and easily causing illusions.