Thought I might add a little of my own experience to
@wood1954 ‘s here. I picked up a 5 gallon freshly dumped Brother Justus whiskey barrel from Midwest Barrel Co on Black Friday for $166 shipped.
I thought I’d follow the suggestions from a link I found to try to extract any remaining whiskey:
Extracting Alcohol from Old Whisky Barrels? - RedFlagDeals.com Forums. I poured one gallon of boiling distilled water into the barrel, replaced the bung, and let it sit for 3.5 weeks, rotating it a little every few days. Last week I opened it up and poured the liquid out. There was still quite a bit of char floating around.
I ran it through coffee filters twice and ended up with about 3/4 of a gallon of lightly colored ‘second run whiskey.’
The taste is mild but not unpleasant and definitely has an alcohol burn going down. This is an ‘American single malt’ so the flavor profile is closer to Scotch than bourbon.
I then continued to rinse the barrel until I no longer was getting large chunks of char like this.
I then filled it with water and Oxiclean for a few hours, dumped it and refilled with k meta and citric acid overnight, dumped again and repeated. After the last rinse there was barely any char coming out with the rinse water.
I’ve now filled it with my second run wine and will leave it around two months before considering whether to put one of my other wines in it.
If I were to do it over again, I might have bought their new 5 gallon barrel instead as it states it has a milder char/toast and was on sale for only $120 at the time, but I wanted a neutral barrel and thought buying a used one would save me some trouble neutralizing it. I’m not really concerned about the flavor at this point, but really don’t like worrying about cleaning all of the char out.