Replacing your wipers two times a year is mandatory. You need to do it before fall and after winter. However, not every driver is careful enough to do it. If you count yourself in this negligent category, you should at least pay attention to more or less obvious signs. With time, the rubber becomes rigid and cracks. Therefore, wipers no longer fit the screen perfectly. They leave specific marks on the windshield, but they may also creak. Once you hear those problematic sounds, you know that it is time to go to http://wipersdirect.com/ and get a new pair as soon as possible.