Noisy/juddering wiper blades

[Max Shine]

I have a 2012 E220 and have recently replaced the wiper blades with a front pair Bosch A939S. These are the second pair of the same wipers I have put on as the same happened with the first set (thought it was just a duff set). They are noisy, they judder and are just horrible. If I squirt the windscreen, they quieten up but as soon as the screen wash has all but gone and just rain is left, they go back to juddering.

My windscreen is perfectly clean and wipers are new and have been cleaned numerous times along the rubber is soapy water - what can be the problem?

 

[whitenemesis]

Dealers have a setting up tool/gauge that adjusts the angle of attack (for want of a better term) of the blade. My wipers were always squeaking and juddering, a judicial twist of the wiper arm sorted it...

 

[Max Shine]

Thanks - I shall give it a go