How does the oil film on car windshields form?

[SanKeira]

There are several reasons for the formation of oil film on car glass: 1. Vehicle exhaust: Due to incomplete combustion of gasoline, various exhaust pollutants are produced. These pollutants are often trapped on urban roads, especially behind trucks, and inevitably adhere to the car glass, forming an oil film. 2. Smoke and dust pollution: If the car is frequently parked near restaurant chimneys, over time, a lot of smoke and dust will accumulate on the glass. If not treated for a long time, it will form thick grease scales. In addition, insect remains, bird droppings, tree sap, etc., can also adhere to the car glass, affecting the transparency of the glass and even turning into an oil film.