You should also check your windshield washer system. Do both squirters work? A nozzle could be clogged with dirt or a hose may be kinked or loose. Do the nozzles need adjusting? Does the washer pump deliver an adequate stream of solvent? The vehicle may have a weak washer pump, or a clogged, kinked or loose hose. The wiper blade performance depends on the condition of the wiper arms and holders. The amount of spring tension on the wiper arm, the number of pressure points or claws that hold the blade, and the design of the blade itself all affect the blade’s wiping ability. If the springs in the arms are worn out, the wipers may not be pressing firmly enough to wipe your windshield clean. In this case, replacing the blades won’t make any difference because the problem is weak arms not bad blades.

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