See also:

Cleaning the exterior lighting
  Clean the plastic lenses of the exterior lights with a wet sponge and a mild cleaning agent, e.g. Mercedes-Benz car shampoo or cleaning cloths. Only use cleaning agents or cleaning ...

General notes
WARNING All categories of messages contain important information which should be taken note of and, where a malfunction is indicated, addressed as soon as possible at an authorized Mercedes ...

Front fog lamps
WARNING If you suspect that driving conditions will be foggy, turn the light switch to before you start your journey. Otherwise, your vehicle may not be visible and you could endanger yo ...