Cleaning
If your windshield is not clear after using the windshield washer or if a wiper blade chatters when running, wax or other material may be on the blade or windshield.
Clean the outside of the windshield with a washer solution or a mild detergent. Your windshield is clean if beads do not form when rinsing with clear water.
Clean each blade by wiping it with a cloth soaked in a washer solution or a mild detergent.
Then rinse the blade with clear water. If your windshield is still not clear after cleaning the blades and using the wiper, replace the blades.

Worn windshield wiper blades can damage the windshield and impair driver vision.
See also:
Air pollution
Industrial pollution, the presence of salt in the air
in coastal areas, or heavy road salt use accelerates
the corrosion process. Road salt also accelerates
the disintegration of paint surfaces. ...
Manual transmission (if so equipped)
WARNING
● Do not downshift abruptly on slippery
roads. This may cause a loss of control.
● Do not over-rev the engine when shifting
to a lower gear. This may cause a
loss of control o ...
Drinking alcohol/drugs and driving
Never drive under the influence of alcohol
or drugs. Alcohol in the bloodstream reduces
coordination, delays reaction time
and impairs judgement. Driving after
drinking alcohol increases t ...
