I had a buddy cut up my keg last night and we used a step bit to cut the valve hole. I wasn't really paying attention when he started cutting and before I knew it he had dumped about a cup of 5W-30 into my new keg. He insisted that it's no different from cutting oil. When I got it home I immediately filled it with water and oxiclean and scrubbed the hell out of it, but it still just reeks like an old car engine. Anyone have any recommendations on how to get it any cleaner? Is there something that will get oil off completely?