Wipe on wipe off. Wipe on wipe off. Wipe on wipe off. If your wipers are wiping on as much as they are wiping off, then its time to change your blades. Wipers that no longer perform as expected, or no longer provide a high level of safety, should be changed. Over time, a rubber wiper blade naturally dries out due to the aging effects of UV rays and heat. Dust, sand, and other contaminants can also damage the rubber wiping edge. As the rubber dries and ages, the blade stiffens, and can crack or separate. An aged wiper blade will chatter, smear, streak, or skip across the windshield.