Why can't the window glass scrape off rainwater when raised or lowered?

[IslaFitz]

When the car window glass is raised or lowered, it cannot scrape off rainwater, and you can only use a towel to wipe it. Here is some information about the window regulator: Classification: The window regulator is the lifting device for car door and window glass, mainly divided into two categories: electric window regulators and manual window regulators. Nowadays, many car door and window glasses are generally raised or lowered using button-operated electric regulators. Components: The electric window regulator for cars is mostly composed of a motor, reducer, guide rope, guide plate, glass mounting bracket, etc. The master switch is controlled by the driver to open or close all door and window glasses, while the individual switches on each door handle allow the driver to control each door and window glass separately, making the operation very convenient.