Place 2 tablespoons of baking soda in a microwave-safe bowl.
Add about a cup of water.
Put the bowl in the microwave for 2 to 3 minutes.
The baking soda will absorb the odors, while the steam will loosen the caked-on food and oil on the walls of the microwave.
Remove the bowl, and wipe the microwave down with a rag or paper towel.
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