For burnt-on food, sprinkle baking soda over the bottom of the oven and then spritz it with water from a spray bottle. Let it sit overnight and then remove it in the morning with a sponge, and most of the gunk in the oven will come out with it. If baked-on spills still remain, sprinkle on some more baking soda and then add a little bit of white vinegar. Let the bubbling mixture sit for 30 minutes, then scrub.To remove the cloudy residue that has made a glass oven window nearly opaque, try mixing baking soda and lemon juice into a thick paste. Rub it onto the door, leave it for half an hour and then scrub, and the glass will be clear and shiny again.
Finally, for those situations where elbow grease just doesn’t seem to cut it, don’t be afraid to use the self-cleaning function on your oven if you have one. Self-cleaning ovens heat up to temperatures that can reach 900 degrees Fahrenheit to burn off spilled food. While this process uses a lot of energy, it’s offset by the fact that self-cleaning ovens are double-insulated, reducing your overall energy consumption from regular use. Just try not to use it more than once a year or so.
Also, there is a tip about putting oven racks in a large garbage bag with ammonia overnight. After soaking, you can spray them clean.