Was your frost on the inside or the outside of the glass?
Inside, I recommend parking the car in a garage with the windows down for a few days to dry it out. Outside, I recommend fresh wiper blades and Prestone Windshield DeIcer, with a freezing point of -34°F. It's potent stuff.
I had a pervasive issue with frost on the inside of the Insight this winter, which killed my fuel economy on more than a few commutes.