[header] How to get rid of microwave smells [title] Microwave a water and vinegar mixture. [step] Combine ½ cup (118 ml) of water with 1 tablespoon of white vinegar in a large microwave-safe bowl. Put the mixture in your microwave and nuke for roughly five minutes at its highest setting. 
Then let it sit with the door closed for about 10 to 15 minutes. This will enable any gunk or crusted bits of food to absorb the steam, which should work them loose and negate most odors.