The polar vortex has caused extremely low temperatures across North America, with video showing washing fluid instantly crystallising on a windshield in Montreal.<br /><br />The clip, filmed on January 31, shows the windscreen of the car completely clear but after using some windscreen wash, the window instantly starts to freeze over.<br /><br />David Freiheit, who admits he’s no scientist, explains what’s happening in the clip: “The windshield fluid is about 40% methanol alcohol (the poisonous kind). It evaporates faster than the non-alcohol water base of the windshield fluid. <br /><br />"So once the alcohol evaporates, the remaining liquid / water layer freezes and crystallizes off whatever impurities it finds to crystallize off. And the pattern is just how ice crystals form in water."
