Burnt popcorn odor is pesky and persistent. It's hard to get rid of the odor hours after the incident. However, not all hope is lost. You don't have to wait days for the lingering stench to disappear (while eating leftovers that smell like burnt popcorn) -- you can do something about it!
Ways to Get Rid of Burnt Popcorn Odor
Put some charcoal briquettes into your microwave to absorb the odor. Leave them there for a few hours.
Place a bowl filled with lemon juice in your microwave. Vinegar is also an option (anything acidic should do the trick). Heat the bowl for two or three minutes. After it's been heated, leave the bowl in the microwave for a few hours. After you have removed the bowl, wipe up and clean your microwave with a sponge and a cleaning agent.
Clean out your microwave with hot water and soap. This is the classic method. You can also put a box of baking soda in your microwave. Make sure you close the door. Leave it like this for a day or two, then open the microwave door for one whole day.
Wait it out. A little burnt popcorn odor never killed anybody, although it's highly unpleasant to smell. If you wait a week or so, your microwave will smell good as new again. However, since most of us can't wait that long, there are the aforementioned surefire methods to eliminate the smell.