How can I get the frost off of my windshield quicker and more effectively?

How can I get the frost off of my windshield quicker and more effectively? Actually, it's my brother's car. In the morning, before we leave for school, the outside of his car is always layered with difficult-to-remove frost. It takes about 10-15 minutes to scrape it off with a windshield scraper. I was wondering if [...]