ice and snow, sand, dust and insects attack the leaves of the windshield wipers on high.
To to always have a clear view, they must be replaced regularly. Streaks and strips might otherwise irritate when driving strong.
Even the wiper on the passenger side needs to be renewed so that the eye remains undimmed to the right.
also sunlight and cold air from the rubber wiper blades to age, resulting in induration. This prevents the uniform pressure of the wiper blades on the disk so that the water is not wiped out completely. This leads to streaking and visual disability. Automobile associations (eg Arbö http://www.freiefahrt.at/ff07_2007.html?startpage=35) recommend that the Wiper blades at least 1x a year to swap.
