With the Polar Vortex scheduled to hit tomorrow, prepping the car is now required. For everyone here's a tip: If your car lives outdoors like mine does, put one of those 1500W under-the-desk heaters in the passenger foot well and run an extension cord back to a lamp timer in the nearest outlet. Set the timer to start about 1/2 hour before you plan to leave, and when you do, your car will be warm and frost free. Don't forget to unplug the heater and toss the end of the extension cord out of the car before backing out of the drive.
Several newer cars have power windows that need to roll down about 1/2" before the doors can be opened. This makes for a nice snug car but if the windows are covered with frozen water, they may not retract. I now have to carry a small scraper in my lunch bag to insure being able to get in to my Pretentious British Car. The heater trick will help in the morning. Not sure about getting home.