Wiper blades are one of the most neglected components on vehicles today. Many blades are cracked, split, torn, brittle, worn or otherwise in obvious need of replacement. Others may look okay, but do a lousy job of wiping when put to the test.

Ninety percent of all driving decisions are based on a clear unobstructed view of the road, which means good visibility is absolutely essential -- especially during wet weather when vision may be obscured by water, road splash, sleet or snow on the windshield. But good visibility requires wipers that are in good condition. If the wipers are chattering, streaking or otherwise failing to wipe cleanly and consistently, you need new blades -- NOW!

Most experts say wiper blades should be replaced every six to twelve months for optimum performance and driving visibility. That's because wiper blades don't last forever. Natural rubber deteriorates over time. Halogen-hardened rubber as well as synthetic rubber provides longer life. But eventually all blade materials fall victim to environmental factors. Exposure to sunlight and ozone causes the rubber to age, even if the wipers aren't used much.

Cold weather can affect blade life, too. Freezing temperatures makes rubber hard and brittle, which increases the tendency to crack and split. The holders can also become clogged with ice and snow, preventing the holder from distributing spring tension evenly over the blade. The blade "freezes up" and leaves streaks as it skips across the glass.

Heavy use can be hard on wiper blades, too, because dust, abrasives, road grime and even bug juice wear away the edge that the blades need to wipe cleanly. As the blade loses its edge (which is precision cut square to maximize the squeegee effect), water gets under the blade and remains on the glass. The result is reduced visibility and poor wiping action.

Any blade that's chattering, streaking or doing a lousy job of wiping, therefore, is a blade that's overdue for replacement. The same goes for any blade that is cracked, torn, nicked or otherwise damaged.

NAPA Auto Care Centers are offering a special Buy One Get One Free offer now thru December on wiper blades.  Log onto the The ACNW Appointment Center today to book your appointment with a certified NAPA Auto Care center.