1. Make sure that all the jets of the layman are clean and a strong jet of liquid follows from the jets. Headlight jets should be adjusted like this. so that the jet of liquid hits just above the center of the headlight glass. On a dual jet windshield washer, to ensure complete windshield cleaning, direct one jet just above the middle of the windshield and the second jet just below. If necessary, adjust the jets with a needle.
2. Mercedes-Benz recommends that you change your wiper blades regularly at regular intervals, regardless of condition (see "Weekly check").