Wiper Fault Diagnosis
| Symptom | Possible reasons | Remedy |
| slippage | Rubber pollution | Scrub the rubber bands with a stiff nylon brush with a detergent solution or alcohol |
| Tousled gum sponges, gum damaged | Replace brush rubbers | |
| Aging of rubber bands of brushes, cracked surface | Replace brush rubbers | |
| Remaining traces of water quickly form droplets | The windshield is dirty with oil paint or diesel exhaust | Clean the glass with a clean cloth to remove grease, silicone oil |
| The brush cleans well in one direction and bad in the other | One-sided elastic band deformation | Insert new rubber |
| Twisting the lever the brush is skewed on the glass | Carefully straighten the lever | |
| Uncleaned surfaces | Rubber out of frame | Carefully insert the elastic into the frame |
| The rubber does not adhere evenly to the glass due to deformation of the tire spring | Replace brushes. This defect most often occurs due to improper installation of a spare brush | |
| Low downforce | Lightly grease the brush pivots and spring or install a new brush |