Clean car window glass is very important, as it directly affects your visibility while driving. Visibility is vital when driving. However, there are a large number of natural conditions that may impede your vision such as, rain and snow. Aside from that, there are a large number of other reasons your windows might get dirty. For example, when road traveling, there is dust everywhere and it is not uncommon for it to get on your vehicle.
If your visibility is impaired, so is your ability to drive safely. After all, driving depends largely upon acting and reacting according to your surroundings. For that reason, it is important for windows, especially the windshield, to be cleaned somewhat regularly.