I did, 5 times so far with every piece and ring removed (Tobeco clone BTW). I figure it must have soaked into the white plastic pieces or the o-rings because I have tried dish soap, vinegar and alcohol to no avail. I vape 9mg non flavored, so maybe I am more aware of it than most.The strange taste is most likely machine oil. Have you stripped it down completely and thoroughly cleaned it? Stripping down the deck section is important as is removing the afc screw.
Once I accidentally forgot to lock my Nemesis with Magma on top for a minute or two and I could not get rid of the burnt plastic taste until I removed the white insulator bowtie thing in the juice well.