Interesting thread, it is amazing just howw much technicality can appear relative to discussion on relatively simple issues....? OK I am guilty of that myself from time to time...(-:
My old +8 Mog has what I imagine are original MMC fitted wiper blade types... ? I replaced them with a spare set of the original pattern that Kevin supplied with the car, the original blades suffering rubber rot after circa 20 years..
I have never suffered wiper judder on my old +8. I wonder if more modern blade designs may be in use, that the angle of the very edge of the blade as it presents it`s self to the screen, may be such that it is not being dragged across the glass, but presented as if scraping across the surface, more likely if the blade rubber has hardened somewhat..?
Sure the end profile of the blade rubber should be such that the section presenting the edge of the blade to the screen can flip and flop relative to the direction of the wiper arm arc, which then allows it to drag across the screen in both directions of the arc..?
On my old blades such is their design that the whole blade assembly can flip and flop easily on the arm, such is the amount of play in the area around the juncture of both. I suspect were they a tight fit that the blades would perhaps be less effective..
I have known of windscreen de-icing sprays that rotted blade rubbers. Might also be worthwhile checking the washer bottle additives, if you have any in use.. ?
I have been rough at times cleaning windscreen if contaminated, even to the extent of using soft grade steel wool and a spot of paint thinners.... Yeah you don`t want to be damaging paintwork from dripping thinners. Also if you get the screen really clean and have not also cleaned the possibly contaminated wiper rubbers, then you could just spread the crud back over the screen...?
Just thinking in type...in the hope it might help. Of course I could be entirely wrong.... again..!!! (-:
Thanks Luddite.. Yes I follow your reasoning.. Sadly the blades are less than 6 months old and the rubber feels compliant. The wiper arm blades are also adjusted on their arms so they present a ( non loaded ) angle to the screen and the rubber is not loaded in one direction. The blades themselves are a good fit on their arms. I have semi discounted the blade design as an issue as the original MMC blades juddered even worse. I am thinking about the screenwash though, as when the car was returned from the factory prior to Christmas the judder was not as bad as it is now, it was still there, but not as severe.
