Interior self cleaning ovens.
Never use a commercial oven cleaner on a interior self-cleaning oven. These harsh cleaners can pit, burn, and eat into the porcelain surface. The result? When you reach the normal 850- to 900-degree level for self-cleaning, you can actually pop chunks of porcelain off the oven walls. Instead, let the intended high heat action turn food spills into carbon, which all but disappears with complete combustion, and then wipe up any minor dust-like ash residue with a damp cloth, paper towel, or sponge when the oven cools.
Don’t open the oven door if you notice a flame-up or smell something burning. The oven is doing what it’s supposed to do. If you’re really worried, shut the oven off. The lack of oxygen in the closed and sealed oven and diminishing heat level will extinguish any burning in a matter of moments.