Most wiper blades typically last about a year. Before investing in new blades there are a couple simple steps to insure you need blades. First thoroughly clean the windshield with a good ammonia based window cleaner. This will remove any wax build up that may have accumulated on the window. Secondly wipe the edge of the blade that contacts the window with a little rubbing alcohol this will clean a way and old rubber deterioration from the blade. Now use the windshield washers and see if the wiper cleans the window properly. If not, it’s time to replace them. When replacing blades, we recommend replacing the blade assembly instead of just the rubber refill. The assembly is the frame which is also the spring that keeps the rubber on the windshield. In most cases this wears at the same rate as the rubber so the proper tension may not be applied to the new refill. Next adjustment, the rubber needs to contact the window in a perfect ninety degree angle to work properly in both directions. To achieve that, the wiper arm may need adjustment as well. This can be a very difficult and time consuming adjustment. When you buy wiper blades from us we install and adjust them for optimum performance at no extra charge.