Before cleaning your wall oven, remove all the racks. You can use a baking soda and water mix to make a paste. Apply the paste to the interior and let it sit for at least 12 hours. Wipe the paste using a clean microfibre cloth. Lastly, spray the oven with a bit of water and wipe with another clean cloth to remove any residue.
To learn more about the best way to clean your wall oven, make sure to consult your manufacturer's manual.