1. Check the condition of the brushes. Replace worn brushes. Brushes are also changed if the glass cleaning efficiency is insufficient. It is recommended to change the brushes annually.
2. To remove the brush, move the brush holder lever away from the glass until the lever is fixed. Turn the brushes 90 degrees, press the inner brush lock with a screwdriver or your finger and remove the brush from the lever hook, pulling the lever through the groove in the brush frame.
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