Was the window wet, just intermittent rain, were the blades smooth or chattering as they moved.
First thing i would do is make sure the blades are clean by just wiping them off with some windex, use your sprayer and see what happens, if the problem is still there, let VW check them out.
Besides being annoying, continued issue is distracting and a could be a safety issue.
They will probably check tension and replace the blades.![]()



