| Malfunction | Cause | Solution |
| The wiper blade is slipping (see photo on the left) | The brush is dirty | Clean the brushes with a stiff nylon brush or rinse with alcohol |
| The edges of the brush are frayed, the brush is torn or worn out | Replace the defective brush | |
| The rubber of the brush has become old and its surface is covered with cracks | Replace the rubber band with a new one | |
| Any water remaining on the cleaned glass immediately forms droplets (see photo in the middle) | The glass is contaminated with an oil-containing substance | Clean the glass with a clean cloth soaked in solvent |
| The brush cleans well in one direction, but poorly in the other (see photo on the right) | The wiper blade is deformed on one side | Replace the rubber band with a new one |
| The brush holder is twisted, the brush is skewed relative to the glass | Carefully bend the brush holder until it is in the correct position | |
| There are still some uncleaned spots on the glass | The elastic came out of the frame | Carefully insert the elastic into the frame |
| The wiper blade does not adhere evenly to the glass due to deformation of the spring rails or frame | Replace the brush. This defect most often appears when the rubber is installed incorrectly | |
| The glass holder pressing force is too low | Lightly lubricate the brush holder spring and hinges or install a new brush holder |
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