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Examine the wipers for cracks. Old windshield wipers become hard and cracked over time, especially in hot, dry climates. If your wiper seems to have lost it's rubbery spring, it's probably time to replace it.
Pay attention next time it rains. If your wipers leave streaks of water across your windshield that aren't much easier to see through than pounding rain, their rubber has probably lost its grip.