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When windshield-wiper blades become worn or damaged, they lose much of their effectiveness. Common problems include streaking, chattering and the inability to clear the windshield of water. Wiper blades should usually be replaced once a year.
If the rubber blade refills in your wipers are dirty but not badly worn, wiping the edge of the blade with washer fluid may help recondition the rubber and improve performance. This won't help, however, if the blades are cracked, split or severely worn.
The most economical repair is to replace the wiper refills, which slide in or attach along the edge of the blade.
If you're having trouble pinpointing the problem, you may need to replace the entire wiper blade. Lift the wiper arm so that it's perpendicular to the window. The blades usually snap easily into a hook or a fastener on the end of the wiper arm. Remove the old blade, and replace it with the new one. A firm click indicates that the blade is seated properly.
Some rear-window wipers have a wiper arm that also houses the washer spray-nozzle. To replace this type of wiper, lift the cover and remove the nut that holds the wiper arm. Detach the washer-fluid supply tube, and remove the wiper-arm assembly. Reverse the process to install the replacement arm.
High-performance wiper upgrades are available too, including some that incorporate a triple edge or a wind spoiler to increase down force at highway speeds and create better contact with the window.
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