help with removal please
They have all workshop manuals online for a subscription fee. They're great source.
Blade: No need to open the hood. Pull the wiper away from the windshield. Rotate the blade around the pivot until it clears the tab. Pull the wiper up and off.
Arm: Haven't tried on a W215, but on a W210 you pull the cover up (it's secured with tabs underneath), slide it forward down the arm, and you'll see bolts underneath to remove the arm.


