I think it is Avon that sells a heated plastic scraper. It plugs in to the cigarette lighter socket, and has a wire that gets pretty hot near the plastic "blade". I was given one by my wife, but I sent it to my Mom. I live in Louisiana, while my Mom lives in Ohio and Maryland. I figured she's get more use out of it. I'll ask her if she's used it.
For the little frost we get down here, and sometimes the rather bad ice storms, I use a spray bottle 1/2 full of winter windshield washer fluid and 1/2 Prestone De-Icer Winshield Washer Fluid Additive. With the defroster on, spray on, wait a minute, and squeegee off. Most ice comes off rather easily. Keep in mind that it only gets down in to the 20's here, so I don't know how that stuff will work up north (I'm originally from Ohio, so I'm familiar with the winter challenges). Good thing about the Prestone additive is it helps prevent dangerous re-freeze. I also put a bottle in my washer reservoir with winter fluid. In spring, I change it out to summer bug type.
I've also noticed having my car in Ohio last winter, that a clean windshield makes clearing it easier (I try to clean my glass daily no matter what). My exterior glass is also treated with Rain-X, which is simply amazing stuff. Nothing sticks for long.
Hope this helps.
Dave