Clean the wiper blades if the wipers leave smearing on the glass.
Place the windscreen wiper arms in the service position
►Link.
Applies to vehicles with rear window wiper: Lift the rear wiper arm away from the glass.
Clean the wiper blades using a soft cloth and a glass cleaning solution.
WARNING!
Dirty wiper blades can impair the driver's view - risk of accident.
Caution!
If the wipers still leave smearing on the glass after they have been cleaned, the wiper blades should be replaced
►Link.