De-gunk the inside of your oven using a paste of 1/2 cup of baking soda and 2 to 3 tablespoons of water. First, remove the racks. Then cover the interior of your oven with the paste (avoiding the heating elements), and let it sit overnight. The next morning, wipe up with a damp cloth. Spritz vinegar on whatever residue is left; it will foam and can then be easily wiped away.