2008 Mercedes CL-Class Owner's Manual - Page 602

Operation Vehicle care Cleaning the driving systems sensors The sensors are integrated in the front and rear bumpers and cannot be seen from the outside. They work with the following systems: BAS Plus* PRE-SAFE® Brake* Blind Spot Assist* Park Assist* Advanced Parking Guidance* ! To prevent scratches or damage to the surface, never apply strong force and only use a soft, non-scratching cloth when cleaning the bumper area near sensors. Do not attempt to wipe a dirty bumper with a dry cloth or sponge. 1 Bumper area near sensors Switch off the ignition ( page 365). Use a mild car wash detergent, such as Mercedes-Benz approved Car Shampoo, with plenty of water and a soft, non-scratching cloth to clean the bumper area near sensors. 601