A lot of the time you can eliminate chatter by wiping the blades with an alcohol wipe. I'd try cleaning the window with an ammonia cleaner and wiping the blades with alcohol which should do the trick.
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Daily Driver - 2007 E70 X5 4.8i Sport w/20" Wheels
Summer Fun - 2016 F80 M3 | Tanzanite | Black FULL Leather | 6MT | Executive | Lighting | Driver Assist | Adaptive Suspension | 19" Black Wheels | Black Grills & Sides | Roof
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