1. Make sure that all washer jets are not dirty and a strong jet of liquid follows from the jets. Headlight washer jets should be adjusted as follows. so that the jet of liquid hits just above the center of the headlight glass. On a dual jet windshield washer, direct one jet to just above the middle of the windshield and the second jet just below to clean the windshield completely. If necessary, adjust the jets with a needle. Be aware that as the vehicle moves, the airflow over the hood and windshield tends to push the jets down, so adjust them so that this is possible.
2. Mercedes-Benz recommends that the wiper blades be replaced at regular intervals, regardless of condition (see "Weekly check").