The Non-Toxic Baking Soda Paste Method
Remove the oven racks and mix half a cup of baking soda with a few tablespoons of water to form a spreadable paste. Coat the interior oven surfaces (avoiding heating elements) and let it sit overnight.
Vinegar Spritz & Rack Polishing
The next morning, wipe away the loosened grime with a damp cloth, spritz a little white vinegar over any remaining baking soda residue, and wipe until the enamel and glass door shine.