My wipers have always done this, and replacing them only temporarily fixes the problem. The only time the wipers were actually quiet for a decent amount of time was when Ford actually somehow adjusted the wiper arm...the problem eventually came back.
On a side note (for a bit of a laugh) - my Ford dealership had the nerve to try and tell me that the Focus wiper inserts are not replacable, and I would have to replace the whole wiper arm - $100+ each on the front and even more on the rear - rather than replacing just the inserts. I rang the parts department at the same dealership to confirm this was not the case and got Ford to fit them in the end.
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