Join Date: Aug 2018
Location: Two locations in NH: One near Concord, the other at the 45th.
Sometimes frost leaves a spider-web pattern on the windshield even after the defroster melts it away. There is still a faint trace. You'll probably notice it more when its frosted and its almost invisible when the frost is gone, but it will return next time it gets cold. If you thoroughly wash your windshield it will go away, but it will be replaced by a different pattern next time you get frost.