VISABILITY IS VERY IMPORTANT FOR CARS AND TRUCKS AUSTIN, TX
.In almost all vehicles it is a legal requirment to have some form of windsheild wiper and yet it is a commonly overlooked aspect of car care. The blades of teh wiper are like a squeege, they pull the flat peice of rubber flush across the glass of the windsheild to clear away water and snow. But this is common knowledge, but many people don't know what actually has happened to the wipers when they aren't working anymore.
As the rubber gets older and is used more and more nicks and imperfections form on the edge of the rubber, when this happens it becomes harder for the wiper to form a clean seal against the windsheild and that's how we get streaks. Another way you might be getting streaks is if you have an uneven amount of pressure throught the blade. A ot of times this can happen when snow or ice sit on the blade and weigh it down in different areas.
In theory we would just push down harder or smoothing down that edge and our wipers could last much longer than they currently do but our cars our not programmed to use more force as our wipers age and it is not common car care to wipe the edge of your wipers.