A buildup of road film, oil, or grease on the windshield or the wiper blades can cause the wiper blades to smear, streak, or chatter when being used. Normally wiper blades are good for about 6 months but if you are experiencing these symptoms you may want to try the following.
• Use Glass Cleaner to thoroughly clean the windshield removing anything that might be stuck to the glass. Windshield washer fluid and rain alone will not remove pesky debris.
• Use Windshield Washer Concentrate Cleaner & Antifreeze straight from the bottle on a soft cloth to clean the wiper blades. Doing so will condition the blade rubber. If the wiper blades still smear, streak, or chatter then you may want to consider replacement.