How is the oil film on car glass formed?

[MalachiLee]

Car glass oil film may be formed due to automobile exhaust, oil smoke pollution, or residues from insects, bird droppings, resin, jam, etc. Automobile exhaust contains various pollutants produced by incomplete combustion. Frequent traffic congestion in urban roads inevitably leads to the adhesion of these pollutants on car glass, forming an oil film. Methods to deal with glass oil film include: using glass cleaner instead of tap water, as glass cleaner has better cleaning ability and provides lubrication and antifreeze functions that tap water cannot replace. Additionally, regularly applying a coating on the glass can prevent the formation of oil film. On coated glass, water droplets quickly slide off, ensuring clear visibility during rainy days.

[MilesRose]

I've been driving for decades, especially on busy city roads, and the formation of oil film on car windows is all too common. It mainly comes from the accumulation of various pollutants on the road. Vehicle exhaust contains grease and unburned particles, rubber debris from tire friction with the road surface, and oil stains washed down by rainwater—all of which adhere to the glass. Over time, they oxidize and stick together, gradually forming a greasy, blurry film. What's even more annoying is that it causes glare in strong sunlight and blurred vision on rainy nights, which can easily lead to accidents. I remember once driving on the highway when the oil film made the headlights appear blurry, nearly causing a rear-end collision. Since then, I've developed a habit of regular cleaning. Washing the windows weekly with vinegar or a degreaser to prevent buildup is key to maintaining clear visibility. Don't underestimate this small issue—it's crucial for safe driving.

[VonJudah]

I usually enjoy delving into some chemistry knowledge. The formation of glass oil film is essentially an environmental oxidation process. Pollutants floating on the road, including hydrocarbons from exhaust, tire debris, and dust particles, adhere to the glass surface via air or rainwater. Subsequently, these substances undergo oxidation reactions when exposed to oxygen and moisture, gradually forming a sticky oily film. Chemically, it acts like a permanent coating that is difficult to remove with regular car washing, requiring alcohol-based cleaners for decomposition. In practice, I've found that high-humidity areas accelerate this accumulation process, so post-rainy season cleaning should be intensified. Preventive measures include regular wiping and avoiding parking near industrial zones, which can help reduce oil film issues.

[MicahLynn]

I'm quite environmentally conscious, and the formation of oil film on car windows directly reflects urban pollution issues. Excessive exhaust emissions and increased road oil stains are the main causes. These pollutants spread and settle on the glass, mixing with rainwater to oxidize into stubborn film layers. This not only affects driving visibility but also exacerbates the cycle of air pollution, such as when the oil film peels off and re-enters the environment. When I drive electric cars or walk, I rarely encounter this problem, proving that reducing fuel usage is key. When cleaning the glass, I prefer using natural materials like lemon juice to remove oil, which is both eco-friendly and effective. Simply put, oil film reminds us to pay attention to traffic emission control and promote green transportation.