When your windshield wipers seem to not be working well, try cleaning them with simple soap and water. Dirt, leaves, and pine needles get stuck there. Also if this doesn't work, try roughing up a little with sand paper. Good as new.
I always use a clean shop rag or a strong paper towel soaked in isopropyl rubbing alcohol, wipe that wiper down repeatedly and keep turning the cloth, when it stops turning your wipe black it is clean (oh boy this really restores it GOOD).
Please be careful using sandpaper. We used this tip I seen online somewhere else and it ruined my blades. Husband only sanded them lightly but it ruined the blades and we had to purchase new ones. I agree with the soap and water trick first.
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