Mercedes-Benz 2013 C-Class Coupe Operator's Manual page 120

Windshield wipers
118
Installing the wiper blades
Position the new wiper blade in the retainer
X
on the wiper arm and slide it into place in
the opposite direction to the arrow.
The wiper blade audibly engages.
Make sure that wiper blade is seated
X
correctly.
Fold the wiper arm back onto the
X
windshield.