When they wipe, the blade moves to about a 45 degree angle as you mentioned and then flips to the other 45 degree angle as it comes back on the dowstroke.
I would be replacing the actual rubber wiper blade, even though they look ok they often cause shuddering when they are worn.
Don't get anything fancy, just a simple cheapy single blade one from supercheap or somewhere for less than $5.


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