The last element is a drive system of screen wipers. In old cars, abrasion of pins on which screen wipers are settled may occur, as well as damage of sliding elements of lever system hidden under the screen bottom part. It can assert itself in jerks and irregular wiping performance. As a rule, these elements are assembled as one part, but several drops of penetrating oil can help for some time.
Bad performance of wipers can also be caused by too big gaps, resulting from usage. Whole system geometry changes in uncontrollable way, and signs can be identical: jerking, irregular work, and even blade hitting the glass seal. Unfortunately, in this case it is necessary to replace the whole wiper drive system.
All above observations result from thirty years of experience and laboratory research by our company. Our aim was to draw your attention to the fact how complex and important part of your car the screen wipers are. Take care of each element of this system. Buy only proved products of known manufacturers with long-term experience that guarantee quality, safety and comfort travel in bad weather.