What do most motorists do when their windshield wipers on their beloved Swallow start to leave nasty stains on the windshield? That's right, they change the brushes. Sometimes this approach helps, and sometimes it turns out that even new brushes leave exactly the same stains. Finding themselves in such an annoying situation, it becomes quite obvious that they are not really to blame. It's time to figure out what the real cause of the problem is.
If replacing the windshield wipers does not change the situation with the streaks on the windshield, then it becomes clear that the problem does not really lie in them. Such difficulties often appear in cars older than 5-7 years. So, the reason may lie in the fact that after 3-4 years of stable operation of the car, its windshield and headlights begin to blast. In other words, the glass surface takes the form of a comb, is dotted with small holes that are invisible to the simple eye.
Thus, when the wiper passes over the glass, it fills the formed holes with water and moves on. The wipers do their part in good faith, but then the glass itself is to blame, on which tiny potholes have already appeared. It is very easy to identify this problem: water stains remaining on the glass must consist of very small drops. Unfortunately, there is no specific method of dealing with this ailment. All you can do is make more brush strokes to remove as much water as possible.
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Moreover, if the wipers leave large long streaks of water, then the problem is also not in the brushes, but in the dirt that is between the rubber bands and the surface of the windshield. Most often, the culprit is bitumen, or rather its tiny fragments, inevitably flying from the roadway to the surface of the car body. This problem, in contrast to the one described above, is perfectly solved without any costs (and even more so replacing brushes with new ones). All you need to do is rub the wiper gum well with a clean, dry cloth.
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A source: https://novate.ru/blogs/020220/53286/