Alcohol evaporates. Put a few drops of alcohol in a paper cup and leave it overnight. It should be gone in less than a day. A year should evaporate a lot of alcohol.
If you want to be extra safe and you're tech-savvy, open the case carefully and look for moisture. Otherwise, plug it in somewhere relatively safe and try it (fire extinguisher Class C or ABC handy. -- You need an BC in the kitchen anyway.
http://garages.about.com/od/toolsmaterials/a/fire_extinguisher.htm).
Once tested, put the microwave where you need it.
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