Why is the windshield wiper not cleaning properly?

[JackLynn]

The reasons why the windshield wiper is not cleaning properly are: 1. Oil film on the glass, which requires manual cleaning of the front windshield, and glass cleaner can be used; 2. Check if the wiper has hardened, and the wiper blade needs to be replaced or cleaned; 3. Wiper arm angle issue, which requires using an adjustment wrench to clamp the wiper and then slowly roll it to adjust it 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.