In doing extensive research to try and rid an expensive Bernina sewing machine of an absolutely horrid cigarette smell, it was advised that we seal it up placing a cup of ammonia or white vinegar inside the case overnight. We did this... first the ammonia... helped somewhat. Then a few days later we tried the white vinegar.
People. Take this as a bit of caution, warning, or for whatever it is worth. DO NOT EVER use vinegar. What was a nice shiny barely used machine, now is PITTED from all the rust and corrosion.
Lesson certainly learned - but a very costly one at that.
I. am. so. disgusted.