Infrared reflective windshield
The infrared reflecting glass prevents the vehicle interior from becoming too hot. It also blocks radio waves up into the gigahertz range.

In order to operate radio-controlled equipment, e.g. toll recording systems, areas 1 on the windshield are permeable to radio waves. In these areas, you can install radio-controlled systems.
These areas can best be seen from outside the vehicle by observing the light reflected off the windshield.
See also:
Lowering the vehicle
WARNING
Pump up the collapsible spare wheel before lowering the vehicle. You could otherwise
damage the wheel rim.
Place the ratchet wrench onto the hexagon nut of the jack so that the
...
Opening/closing the help window
In addition to the audible instructions, the
help window will show you other information
during voice control operation and the
individualization process.
Select Vehicle in the main function b ...
Cleaning the headliner and carpets
Roof lining: use soft brushes or dry shampoo if it is particularly dirty.
Carpets: use carpet and textile cleaners that have been approved and recommended
by Mercedes-Benz.
...
