All drivers have been there - you're running late but thankfully you somehow manage to head out the front door on time only to discover that your car is covered in frost and ice.
What do you do? Do you run for the kettle and poor boiling hot water over the windscreen? Absolutely not, like really, who does that?
Do you pick up anything with a relatively straight edge that will etch the ice off, risking scratching the glass? Nope!