If you've completely removed all old cake from the bowl and swabbed the shank squeaky clean, and the presence is still there, I'd say try out the coffee grounds method but be sure to use grounds that are still very wet, pack em tight, and let them dry fully for several days (don't be tempted to remove the grounds early or you'll have to start the process over). If that doesn't do the trick, roll out the big guns and just smoke it out like smudger says. If you're ok with latakia, that will work pretty quickly. Another Lakeland or a goopy aromatic might also eat that ghost, but then you'd be stuck with a bigger one. If you can't stand latakia or other aromatics, a mild tobacco that builds cake quickly like Carter Hall or Prince Al might work to put a layer between the ghost and your face.
