What Causes Persistent Oil Mist on the Inside of the Windshield?
2 Answers
The reasons for persistent oil mist on the inside of the windshield are as follows: 1. Long-term use: Over time, tiny pores develop on the windshield, trapping dust and other airborne particles, which gradually form an oily film. 2. Exhaust fumes: While driving, the oily exhaust fumes from vehicles ahead accumulate on the windshield, leading to oil mist. This phenomenon can also occur on the inside of the windshield if the windows are open. 3. External contamination: Oily substances splashing onto the windshield can cause this issue.
I often encounter the issue of oily fog forming on the inside of the windshield, especially during commutes when it gets misty, blurring my driving vision. This is likely due to the accumulation of tiny oil particles in the cabin air, such as when the cabin air filter hasn't been replaced for a long time, allowing dust and grease to mix into the airflow blowing onto the glass, creating a thin film. Additionally, residue left behind by oily cleaning products used on the windows or external pollutants entering when windows are rolled down can worsen the problem. Smoking inside the car or the volatilization of food odors can also contribute. I make it a habit to gently wipe the glass with a microfiber cloth dampened with water once a month to keep it clean, while also checking the condition of the cabin air filter and replacing it promptly. This helps avoid potential driving hazards and ensures a safer trip every time. Moreover, maintaining a stable cabin temperature and avoiding rapid alternations between hot and cold can reduce the chances of fogging, which is quite practical.
