If cayugads method doesn't work the PB Blaster Pittsburg mentioned is the best stuff around for any frozen part that man ever created. I always keep 2 cans of the stuff on shelf. Used it on a friends Smoke Pole few months ago.He hadn't pulled plug for 5-6 years!! What a mess. Anyway - took me a couple days but PB loosened it up.

Rick,
Come back and let us know how your buddy finaly got the plug out. Good Luck