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Hi Rocky, for a really dirty carboy, especially if I don’t know it’s history, I use Five Star PBW Cleaner. Use hot water and let it soak for about 30 minutes, then hit it with a drill mounted carboy cleaner. It works miracles.

Here is an article by Daniel Pambianchi Here is an article by Daniel Pambianchi on acid adjustments that might be helpful: Acidification/Deacidification - Daniel Pambianchi