The smell of piss would probably have gone if the body had been aired for a couple of days. Preferably somewhere dry. It wouldn't have required the paint to be stripped at all (but of course that would speed up the process).
That silly little biscuit needn't have dismantled and burned his guitar at all.
On a side note, in Iceland, they sometimes piss on shark meat and then bury it in the ground for a six months. Apparently it's a local delicacy.
