At the very least MM, you're going to want to boil it in a 55 gallon drum, and then scrub the heck out of it with a brand new stiff bristled brush, and THEN I'd leave it soaking outside in some kind of tub for a few weeks, changing the water several times, and then scrub it some more... Wood can be LOADED with undesirables, and the boiling, scrubbing, and rinsing are about all I can think of to get rid of them...