I, like every other microwave oven owner, has had to deal with the buildup of smells in their oven. I clean mine, and will even more now that I’ve gone back to scrubbing sponges thanks to new data showing that nuking a sponge for 2 minutes kills all bacteria in them!
However, thats still not enough to cure that popcorn odor, or last three frozen dinners odor. Enter baking soda.
I use Arm & Hammer refrigerator baking soda (which is just baking soda in a box with open sides to allow more surface area to contact air) in my refrigerator and freezer. It works incredibly well and I replace mine every 3 months or so.
Thus I decided to try a box in the microwave oven as well. I take it out while cooking of course and each time I put it back, I turn it upside down to shake up the baking soda some.
My oven is now 98% odor free. Whoot!