After emptying a barrel of a RIS, I filled it with water to strip some charcoal flavor from the barrel with the intention of putting a sour in there shortly afterwards. Life got in the way .... There is mold at the mouth of barrel and the water stinks of sulfur and other septic smells. Is the barrel saveable and how? I'm ready to fill the 26-gal barrel with a flemish red some soured some not.