This steering wheel is smokin'

Evening folks,
I just received an ebay purchase of a steering wheel for my Duster. The later model with a large center vinyl pad. Anyhow, this thing is in great shape, but was fairly dripping with what I guess is tars from 30+ years of smoking in the car. It smells very bad. We've washed it a couple times now and gotten most of the gunk off, but it still smells terrible. Any suggestions for getting this "clean"?
No offense intended for those smokers on the list, but if your lungs are in the condition of this wheel; make sure your life insurance is up to date!
C