So today I noticed that my wiper blades are kind of just "rubbing" the windshield and not really pushing on it at all. So basically it just leaves streaks of water, I hopped out and pushed down on the hinged-ish area and they work the way they should but after 15mins it was back to what it was before. So is there a way to tighten them? The blades are fine themselves it just looks as if they are not pushed up onto the windshield enough causing them to streak. Please help!