I found a natural recipe from learningherbs.com. This absolutely took elbow grease, but the oven is SOOO much cleaner! I could also breathe throughout the entire cleaning process. Always a bonus!
Natural Cleaning Recipes -This recipe uses baking soda, borax, salt water, essential oils and vinegar. The recipe calls for very little water, and I happen to agree with the author of the post. I used almost a full cup of water to get a paste consistency. I also used a rag, scrub brush and of course elbow grease.
BEFORE -Nasty doesn't even describe it. I did not do a thorough job of cleaning it out when we moved in and then had a spill!
AFTER -While it's not perfect, it's leaps and bounds above the oven you see above!
I would use this recipe again and would use the vinegar/oil mixture throughout the house for light cleaning.