[header] How to clean a microwave with baking soda [title] Remove the turntable and support ring, and sprinkle baking soda. [step] Set these pieces aside, on the kitchen counter or in the sink. Sprinkle the baking soda across the bottom of the microwave. 
[substeps] Alternatively, you can use a baking soda paste to clean your microwave. Mix two parts baking soda to one part water and use a butter knife to apply the paste to the inside of the microwave.