As tips blog WonderHowTo points out, Coke can do a quick and dirty job tearing through thick layers of insects, grime, and crap. Pour the soda on to a rag and wash your windshield then rinse with a wet cloth or your regular windshield wipers. Just be careful to avoid getting coke on your paint job. This isn't the best solution if your car is sitting in your drive way, but on a road trip cross country, you may need it after about a mile of Texas bugs.