Answer:

1.First unplug the oven and empty the oven. Clean the grill and baking tray separately, soak them in hot water, then wipe them with a damp cloth and detergent, then rinse them off with water.
2.For the inside of the oven, mix the baking soda with a small amount of water to a thick state, and then evenly spread it on the inner wall of the oven and the glass door for three to five hours.
3.Wipe off the soda mixture with a soft damp cloth or sponge.
4.Pour the white vinegar into the spray bottle and spray it on the surface after wiping, so that the residue of soda can be seen, wipe it again with a damp cloth, and dry it!