Try scraping out as much of the burned food out of the pan as possible. Next, soak the pan in hot, soapy water. After about 10 minutes, remove the pan from the water and add a generous amount of baking soda to the pan. Use a wet sponge with dish soap to scrub out the inside of the pan. Then, rinse your pan and wash normally. If this doesn't work for you, try looking up "How to Treat Burned Pots and Pans" on eHow. They have some good articles on cleaning burned dishware.