1. Check up a condition of brushes of screen wipers. If they are cracked or otherwise damaged, or stain the glass, replace them. Regardless of condition, replace brushes annually to maintain good visibility
2. To remove the brush, move the wiper arm away from the glass until it locks. Rotate the brush 90°, press the lock at the base of the support
3. Slide the brush down off the arm to release it from the support and then remove the brush from the arm. Don't forget to check the brush too (-n) tailgate glass cleaner (in the presence of)