Every morning I see the respectable citizens in this block scrape the ice off their cars for ten minutes per person. I wonder why they don't just use a cover.
The rubbing alcohol spray:- Yes, it works, on top of the ice. The alcohol reacts with the water molecules (ice) to turn the whole thing into liquid. And it isn't harmful to the rubber molding and it won't rust the metal like salt does.
I wouldn't advise adding too much of it to your regular windshield washer fluid, though, because it makes the wipers squeek while operating.
I first discovered this while working security at a waterfront bulk terminal where they had tanks of methanol, another alcohol, which some of the workers used on their own windshields. Later, I found that any relatively pure alcohol will melt the ice on a windshield, and this stuff from the pharmacy is the easiest to get.
Give it a try and see what you think.