Mercedes-Benz E-Class Wagon 2017 Operator's Manual page 123

Slide catch 2 in the direction of arrow
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until it engages in the removal position.
Remove the wiper blade in the direction of
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arrow 4 away from the wiper arm.
3 Installing the wiper blades
Insert the new wiper blade into the wiper
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arm in the direction of arrow 1.
Light and visibility 121
Slide catch 2 in the direction of arrow
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until it engages in the locking position.
Make sure that the wiper blade sits correctly.
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Fold the wiper arm back onto the windshield.
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3