Clean coins with steam?

yes...actually AFAIK arcs occur if there are pointy things on the object being nuked. However, microwave ovens are weird things.

 

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Can't say but a friend of mine burned down his kitchen simply by leaving a spoon in his coffee cup.

 

I'm willing to bet the back end of the spoon was out of the liquid...

 

A dealer I know uses the pressurized steam system used by jewellers. He swears by it - takes off pvc and any other gunk. He only uses it on uncirculated coins or else the circulated coins look cleaned.