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It could also be down to a "greasy screen" - give that a good clean as well. Also the wiper arms themselves may be ever so slightly bent (twisted). Apparently if cars are driven thru a drive thru car was a lot this can twist the arms. If you do use a drive thru car wash always leave the wipers parked in the upright position ( as near as possible) as this can help to prevent the twisting.
Wrap some cloth around the wiper arm and use a pair of mole grips or similar and gently "twist" the arms - just don't over do it.
Another possibility for juddery wipers is they are actually worn - when did you last replace them. The should ideally be replaced at least every 12mths. Also make sure they are a good quality, fitted with spoilers as this helps prevent juddering.
We had a rover 216 once and garage we bought it from fitted new wiper blades - they juddered just as you describe yours. The garage had fitted non spolier blades although spoilers were originally fitted,they eventually fitted "spoiler" blades and they were silent and smooth.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.