The windscreen wipers do not wipe clean? What can be the reason for this?

The combination of choices you selected addresses two potential issues that can prevent windscreen wipers from functioning effectively. Worn wiper blades can lead to poor visibility by failing to adequately wipe away rain or debris. An oil film on the windscreen can also hinder the wipers' effectiveness, as it creates a slippery surface that the wipers struggle to clean properly.

According to German traffic regulations, maintaining visibility is crucial for safe driving, and both of these factors can significantly impair it. Choosing all relevant options ensures a comprehensive understanding of the possible causes, aligning with the principle of vehicle safety and roadworthiness outlined in German law. Recognizing and addressing all issues is essential for safe driving practices.