Why are there streaks when the wiper blades swipe?
2 Answers
There are streaks when the wiper blades swipe due to the following reasons: 1. Aging of the wiper blade; 2. Incorrect angle of the wiper arm; 3. Presence of foreign objects on the windshield. The wiper is a blade structure installed in front of the windshield, consisting of a motor, reducer, four-bar linkage, wiper arm spindle, and wiper blade assembly. Its function is to clear rain, snow, and dust that obstruct the view on the windshield. The steps to replace the wiper are: 1. Lift the metal wiper arm away from the windshield and keep it stable in a position perpendicular to the windshield; 2. Press the tab and remove the old wiper blade, separating it from the metal arm; 3. Insert the new wiper blade, gently rotating the new blade until the hook snaps into place and is secured; 4. Return the wiper to the windshield.
I've been driving for over a decade and often encountered the issue of wiper blades leaving streaks. Most of the time, it's caused by the aging and hardening of the rubber blades, especially in hot weather when the rubber loses its elasticity, leaving marks on the windshield. Additionally, unwashed oil film or insect residue on the windshield can also cause this. I always make a habit of thoroughly cleaning it with a dedicated glass cleaner. If the rubber blades are severely worn, they should be replaced immediately, as driving with poor visibility in the rain is dangerous. I recommend checking the wiper blades every six months and not skimping on quality—choosing high-quality rubber blades ensures a longer lifespan. Also, uneven pressure from the wiper arm or improper installation can cause streaks, which can usually be fixed with a simple adjustment. In short, safety comes first, and these issues should be addressed promptly.
