Just go ahead and take a peek at the blades. Visually inspect for any cracking. You can also feel if they are getting tacky or if they are losing their edge. Even in the car, you can tell if they aren’t working properly anymore. If any of these conditions are true, make sure to get them replaced. You don’t want to get caught out in bad weather with bad wipers. Take some time now and make sure they are up to the task.
Photo Credit: “Thunderchild7”