To avoid scratches on the glass, wipe the wipers regularly with a glass cleaner. If heavily soiled, (for example, insect remains) you need to wipe the brushes with a sponge or cloth.
If the wipers leave scratches on the glass, this may be due to solid particles stuck to the windshield. To remove foreign particles, add detergent to the liquid.
It is recommended to replace windshield wipers 1-2 times a year.
Replacing windshield wiper blades

Removal the brushes
Fold the windscreen wiper arm away from the glass and turn the blade perpendicular to the arm. Press the locking spring (arrow A) and simultaneously press the blade in the direction of the glass (arrow B).
Installing the brush
When installing the brush, the retaining spring must snap into place. When installing brushes with an aerodynamic clamp, make sure that the clamp blades are directed downwards.

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