What causes the wiper to not clean the car glass properly in the rain?

[DelHope]

The reasons why the wiper does not clean the car glass properly are as follows: 1. Wiper angle: The angle of the wiper may cause it to not clean properly, and it can be resolved by adjusting it. If the downward pressure of the wiper is too strong, it may lead to uneven force distribution, in which case the distance between the springs needs to be loosened. 2. Foreign objects on the wiper: If you hear a "squeaking" noise when the wiper is operating, it is likely due to foreign objects trapped between the wiper blade and the windshield, which can also prevent the wiper from cleaning properly. In this case, check for any foreign objects and remove them if present. Alternatively, the wiper blade may be too rough, and smoothing it with sandpaper can help. 3. Wiper hardening: Everything has its lifespan, especially for vehicles frequently parked outdoors, which are inevitably exposed to sun and rain. Over time, this will accelerate the aging of the wiper rubber, reducing its effectiveness. In such cases, it is necessary to replace the wiper as soon as possible.