Awhile back I tore out an article from Martha Stewart Living where they gave a tutorial cleaning the oven using baking soda. I decided to use my Good Friday off work to give the method a try. You mix 3/4 cup baking soda with 1/4 cup water. Then brush the paste all over the oven and let it sit overnight. The next day use a plastic scrapper to remove the paste, wetting as needed.
I am too impatient to let it sit overnight so I let it sit for about 3 hours. I was really skeptical that baking soda would clean some of the seriously baked on grease. After three hours it didn't take it all off, it really only took a little off. But I didn't think it would clean anything and it definitely did do some cleaning. I am sure if I left it on overnight it would have done a much better job. I will probably try it the right way again in a month or two. My only complaint is that it was messy to clean up and a lot of work for it to only be partially clean. For now we have an oven liner on the bottom of the oven to help prevent future messes.