Windshield wipers are required to keep the glass clean, which means that, among other things, they should never leave streaks. Nevertheless, many motorists are faced with an unpleasant problem - stains even from new wipers. Why is this happening at all and is it possible to do something about all this.
In most cases, the stains on the glass as a result of the work of the cleaners remain due to the fault of the wipers themselves, and specifically, their springs. If it does not work properly, then the wipers will regularly run into the seal and may even go beyond the glass. Also, the problem may lie in the electronic drive of the wipers. In this case, they begin to move much more slowly, and with large volumes of work they completely cease to cope. Hence, divorce appears.
Which means either the electric drive of the wipers should be repaired, for which it is best to seek help from the masters, or check and, if necessary, install new springs. Fortunately, the latter are not very expensive. You can find them in any car store.
In addition to direct technical reasons, the problem may lie in things that do not depend on the car or motorist. For example, in the environment. In cities with serious industry, when precipitation occurs, it is extremely likely that a wide variety of harmful substances will be contained in the water or snow. They fall on the glass and form a coating. Most often, even perfectly working wipers cannot do anything with it and just leave annoying stains.
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Which means in such a situation, only manual cleaning of glass and brushes after a trip can help.
Finally, various small debris, the so-called "sandblasting", will fall on the windshield. This problem is most relevant for domestic roads in winter and autumn. Sand crystals and other small foreign particles fall under the gum and prevent it from efficiently cleaning off dirt and water.
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Which means brushes should be periodically cleaned with a cloth. In the most advanced cases, it may be necessary to replace the rubber, as it tends to deform due to sand crystals.
Continuing the topic, you can read
about how to enable the "summer mode" wipers, and what it is for.
A source: https://novate.ru/blogs/170520/54547/