Did you store your barrel dry, or let the airlock dry out? First, fill it with water, dump, rinse, and make sure any yeast spooge is out of it. If it still smells like acetone, then more is needed.
I would go through a deep clean cycle with a caustic, rinse with acid, then burn a sulfur stick in it (don't do this on a fresh bourbon barrel).
If you still have acetone smell, then it is time to recycle it as a planter or firewood.