clearlysuspect:

I have 2 rectangular humidifiers mounted to the inside top of my humidor.  When I went to recharge them a month ago, I found both yellow and green mold.  Scared to death and not knowing what to do I relied on my professional training in aviation maintenance.  On sensitive electronic components, when we find mold, corrosion, etc., we use isopropyl alcohol diluted with water to the lowest ratio possible to remove the corrosion or mold.  If the ratio is not strong enough, you add a little more alcohol until it does.  Well, I didn't have any alcohol lying around so I diluted Listerine into distilled water at a 1:50 ratio.  I seems to be working out really well so far.  No mold, no odors, no damage to the humidor.

Luko:

Just keep in mind if you do, you're pissing off a dude who shaves with a sword.