Remove the cover at the base of the wiper arm (hinges up where the arm extents as it arcs across windshield).
Lube up the shaft with some light grease.
Brian

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Mercedes Benz Master Tech
ASE Master Technician
Diagnostic Technician
Owner of "Behind the Star Inc."
Raleigh NC.
www.behindthestar.com
brian@behindthestar.com