For natural, green cleaning, follow these steps to clean an oven with vinegar, baking soda, and salt.
Remove the oven racks.
Generously spray the whole oven including the inside of the door with the vinegar/water mixture.
Sprinkle baking soda everywhere putting more on any caked on food particles.
Sprinkle a thick layer of course salt over the baking soda.
Spray again with the vinegar/water. You'll hear a nice bubbling sound from the reaction of the vinegar and baking soda.
Leave it to sit overnight.
Spray again with vinegar/water to help remove everything.
Wipe the oven with old towels or paper towels.