There are a few ways to determine whether your current windshield wiper blades have overstayed their welcome.
First, take a look at them. Does the rubber look cracked and brittle? The result can be insufficient windshield wiping coverage. Are the frames rusty? That can happen when your blades have served you through winter weather or in a marine environment. Also check to make sure the blades have good contact with the glass, since a bend can hinder them from doing their job.
The easiest way to know you need new blades is by using your current ones. Do they leave streaks? Make a squeaking sound? Chatter across the windshield? Probably time to say goodbye and start with fresh ones.
How can you keep your blades working at their best as long as possible? Make sure your windshield is clean, and never use your windshield wipers on dry glass. Bear in mind, wiper blades aren't meant to last forever because rubber is a natural product that is affected by its environment. We recommend inspecting your windshield wiper blades every six months and replacing as needed for maximum visibility.