A preventive check up of our vehicle is necessary to ensure it lasts long without much hassle and to assure us of a safe trip. In addition, part of maintaining our car is the regular monitoring of the water and oil level. While doing these things, we should also check our wiper blades because they are always exposed to airborne contaminants. But how do we do that? Here are a few tips: You can put some windshield cleaner onto a paper towel and start running it through the edge of the blade. This takes off the road dust and grim, salt and whatever contaminants it might have contacted. You can also use a clean shop rag and rubbing alcohol for the purpose. Furthermore, you should also wash the wiper while you wash the car. It is also important to note that the blades of your cars wiper should be changed twice a year or every after 6000 miles traveled.