Just pull the wiper arms downward and you'll see an 8mm nut. Unsrew that and pull on the wiper arm. It should come right off. You will need to unplug the washer tube if you are replacing the wiper arm and plug it onto the new one.

Hope this helps.

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DeeBee

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82 MB 300D
84 MB 240D

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90 MB 200E

70 MB 280S (soon to get a 617)