I would imagine the most effective way (without removing it) would be to starve out a polyp. Keep in mind I haven't tried this myself, but what I would do is touch the polyp to make it close, then put a drop of crazy glue/frag glue on it so the polyp cannot open up. It would take some time but Id imagine the guy would melt away if it can't get any food or light...
Edit: wait and see if anyone else can chime in on this idea though before you give it a shot.
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