Why does the wiper produce a misty effect on rainy days?
2 Answers
The wiper producing a misty effect on rainy days could be due to oily substances on the glass surface forming an oil film, causing water droplets to disperse in a misty pattern. It could also be because the wiper is old. You can try polishing it yourself, which might improve the effect to some extent, but it is recommended to replace the wiper with a new one directly. The wiper, also known as a windscreen wiper or windshield wiper, is a device used to wipe off raindrops and dust attached to the vehicle's windshield, improving the driver's visibility and enhancing driving safety. The main reason wipers often fail to clean thoroughly is invisible dirt on the glass: 1. The car is parked downwind of a central air conditioning cooling tower, where water particles torn apart by the cooling tower fall on the glass, forming small white spots that are hard to remove completely after drying; 2. The sticky residue of insects crushed during long-distance high-speed driving.
After driving for so many years, it's quite common to encounter a foggy windshield when the wipers are used in the rain. The main reasons could be that the wiper blades have aged, with the rubber becoming hard over time, failing to clean the rainwater properly, leaving a water film that looks like fog. Or, there might be oil stains or dust accumulation on the windshield surface, from exhaust fumes or daily pollution, which becomes blurry when water hits it. Additionally, if the humidity inside the car is too high, forming a temperature difference with the cold air outside, water droplets can easily condense on the glass. I generally recommend regularly checking the wiper blades and replacing them every six months, using a neutral cleaner to wash the windshield and remove oil stains. Turning on the air conditioning's defogging function is also very effective. When visibility is poor, don't force yourself to drive—safety first. Getting maintenance done before the rainy season can save a lot of trouble.
