Why is there an oil film after the wiper wipes?

[DiAndres]

An oil film appearing after the wiper wipes is usually caused by exhaust emissions from vehicles ahead during traffic congestion, or it may result from parking near exhaust vents of range hoods. Wiping the windshield with hot water can remove the oil film, or you can use dishwashing liquid to clean the windshield. Wipers, also known as windshield wipers, water wipers, or windscreen wipers, are devices used to wipe away raindrops and dust attached to the vehicle's windshield to improve the driver's visibility and enhance driving safety. Due to legal requirements, almost all vehicles are equipped with wipers. Rear windows of hatchbacks and SUVs also have wipers.

[OCameron]

I often encounter the issue of oil film on the rear windshield wiper while driving, mainly due to oil stains on the road. For instance, when large trucks pass by, they may leak engine oil, or vehicle exhaust fumes disperse onto the glass, forming a greasy film over time. Additionally, as wiper blades age or accumulate dust with prolonged use, their wiping effectiveness diminishes, making it easier for residues to remain. If the wipers don’t clean properly, especially during rainy days, it can be very dangerous—blurred vision and increased risk of skidding. I recommend regularly inspecting the wiper blades and replacing them if significant wear is evident. Also, use a specialized glass cleaner to thoroughly wash the windshield; those oil-film removers available in supermarkets work quite well. Avoid using just ordinary soap, as it can lead to quicker oil film formation. Making it a habit to pay extra attention to windshield cleanliness during car washes can save a lot of trouble, after all, safety comes first.

[LeJeremiah]

I've seen this situation many times, and it's mostly caused by environmental pollutants. Oil smoke particles floating in the air or oil stains on the road accumulate on the car windshield. When the wipers sweep, water mixes with the grease, leaving behind an oily film instead. Sometimes, improper car washing with residual detergents or wax products can also cause this. If the wiper blades become hardened or deformed after prolonged use, they won't clean effectively. I would remind everyone not to overlook this issue, as it not only affects visibility during rain but may also cause the wiper blades to wear out faster, leading to squeaking problems. Cleaning the windshield promptly is simple—I usually use a vinegar and water solution to spray and wipe. Additionally, check the wipers every six months and replace them with affordable new ones if they're worn out. Driving safety is crucial, so don't let small issues turn into big problems.

[SimonLee]

When I first started driving, I also wondered why there was an oily film after wiping. Later, I realized it was due to oil stains on the windshield. It might be because the wiper blades were old and couldn’t clean properly, or road grease built up over time. You need to rinse the glass more thoroughly when washing the car. Simply put, replacing the wiper blades can solve most cases; using professional glass cleaner works even better. Don’t wait until it rains and visibility is poor—that’s too dangerous. I’ve tried cleaning it myself, which is low-cost and quite effective. Take action now.