What Causes Oily Buildup on the Inner Side of a Car's Windshield?
2 Answers
The causes of oily buildup on the inner side of a car's windshield are: 1. Long-term vehicle usage leads to the formation of pores where dust, fruit residues, and tree sap accumulate, creating an oily film; 2. Exhaust fumes from vehicles ahead accumulate on the windshield over time while driving; 3. Consumption of oily or steam-producing items inside the car. Methods to address oily buildup on the inner side of a car's windshield include: 1. Cleaning with a glass oil film remover; 2. Wiping with alcohol-based wet wipes; 3. Using dimethylbenzene for cleaning; 4. Scrubbing the glass surface with a nano sponge; 5. Avoiding smoking or consuming oily items in the car.
The inner side of the car's front windshield gets oily. I've been driving for over ten years, and the most common cause is improper use of the air conditioning. In winter, when the air conditioning blows hot air, the high temperature inside the cabin meets the cold glass, forming condensation and an oily film, which accumulates over time into a layer of grease. Additionally, the breath exhaled by people contains oil, which becomes more noticeable when there are many passengers or smoking in the car. Using low-quality air fresheners or perfumes can also lead to chemical volatiles forming an oily residue on the glass. I remember once during a long night drive, the windshield suddenly became foggy, and I later realized it was because the air conditioning had been set to recirculate for too long, trapping moisture inside. The solution is quite simple: regularly wipe the inside with a clean cloth dipped in glass cleaner, and switch the air conditioning to external circulation to ventilate and dehumidify, preventing oily buildup that affects visibility. Developing good driving habits, such as turning off the air conditioning a few minutes before parking to allow air circulation in the cabin, can also help.
