Are you talking about the smell in your microwave go away, so you do not have to throw it away?
Have you tried baking soda? Just set a box in there, with the door closed. It may work.
Put some vinegar in a bowl in the microwave & either let it sit like that or turn the microwave on for about a minute to get it to boil & let it sit. Vinegar is the best thing to get smells out... especially smoke/burn smells~
Lol. Has anyone seen, "Just Friends?" Anna Faris, who plays the Britney Spears-like pop star puts her aluminum wrapped meal (if I recall correctly) into the microwave. 
It happens to the best of us! 
Ooo, I sterilized a sponge that way and did the same thing. What a horrible smell! Cleaning the microwave should help, but we had to really air the house out and I could still smell it for a couple of days.
Cheers, from
SwampWitch
I put a cup of used coffee grounds in a cup in there and microwaved it for 10 minutes and that helped a lot.
I used to work for a company that also owned their own trucking company. When we'd get a smelly load (dont' ask!), the drivers would empty cans of coffee grounds in the truck and let it sit overnight, then sweep it out the next day. Worked everytime!
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