When the windshield wiper come back, there are water marks on the windscreen. This is a phenomenon that the scraping is not clean. It should be dealt with immediately. Otherwise, the water marks left behind will affect the driver's sight and pose a certain safety hazard. It should be checked to improve the safety factor.

Here are the reasons why water marks on the windscreen:

1. The bad quality of new wiper blade with rough rubber. Not only will water marks appear after wiping (the scraping is not clean), but also accompanied by a “Crunching” abnormal sound, then you have to use abrasive paper to grind it.

2. The second is the problem of uneven force, which causes the windscreen wiper to be unclean. At this time, the distance between the springs needs to be relaxed.

3. Angle problem: Try holding the wiper with a debug wrench and turning it slightly to adjust to a vertical position.

4. It may be because the wiper is doped with some impurities, so that the wiper cannot effectively scrape the glass, and the impurities must be cleaned up.

5. Water stains are not necessarily a wiper problem, it could be an oil film on the windscreen.

Tips: Pour a basin of water on the glass, if there are many small water droplets attached to it, it means there is an oil film on the glass. This oil film has a strong adhesion to water and is very difficult to remove even use the wiper blade. At this time, it is necessary to use the cleaning effect of glass cleaner to remove the oil film.