For use in cleaning barrels, mix 0.25 to 0.5 ounces per gallon of barrel in cold or warm water, and dissolve completely. Pour into barrel, and top up with water (do not use hot water, it will release the hydrogen peroxide too quickly). Soak for a few minutes, up to a few hours. The longer the soak the more tannins will be extracted from the wood, reducing the life and flavor of the barrel. Drain the barrel, rinse with water, and rinse the inside of the barrel with a citric acid solution (1 tbsp citric acid per 5 gallons water) to neutralize the caustic sodium carbonate. For general cleaning of equipment, use .5 to 1 ounces per gallon of water.