What are the reasons for blurred wiper wiping?

[OEden]

The reasons for blurred wiper wiping are: 1. Oil film on the glass, requiring manual cleaning of the windshield, which can be washed with glass cleaner; 2. Check if the wiper has hardened, necessitating replacement of the wiper blade or cleaning the wiper; 3. Wiper arm angle issue, requiring the use of an adjustment wrench to clamp the wiper and then slowly roll it to adjust to a straight state. The method to replace the wiper is: 1. Lift the wiper arm from the windshield; 2. Press and hold the release lock pin, then move the wiper blade along the wiper arm; 3. Remove the wiper blade; 4. Insert the new wiper blade into the wiper arm until a click sound is heard.