Is it normal for new car glass to have an oily film?

[Paul]

It is not normal for new car glass to have an oily film. The formation of an oily film on car glass is mainly due to prolonged use of the windshield, prolonged exposure to car exhaust, airborne dust, bird droppings, insect remains, etc., which gradually forms the oily film. When driving frequently in congested urban areas, the gases emitted by vehicles ahead can adhere to the car glass and form an oily film. If the car is often parked near restaurants, the oil fumes in the air can also stick to the glass. If not cleaned, this can develop into a thick layer of oily residue. If an oily film appears on the glass, it should be cleaned promptly. Do not use tap water during the cleaning process; instead, use specialized glass cleaner, as it has lubricating and cleaning functions. You can also periodically apply a coating to the glass by using a coating agent yourself. Coated glass has the effect of preventing oily film formation, and during rainy weather, rainwater will not obstruct visibility. If the driver is unsure how to determine the presence of an oily film, they can turn on the windshield wipers. If the glass remains blurry after cleaning, it indicates the presence of an oily film on the car glass. Simply clean it with glass cleaner or a specialized glass cleaning agent.