Sodium percarbonate is the most common alkaline chemical found in cleaning products, being very effective in dislodging heavy deposits from tank walls or removing greasy residues.
A dilute 1% solution is sufficient for most applications. Sodium percarbonate has the advantage of dissolving tartrates and neutralizing acetic acid in problem barrels.
Sodium percarbonate is commonly found in household laundry detergents. In water, it dissolves to release sodium carbonate and hydrogen peroxide, a very effective disinfectant and bleaching agent on most materials. It is highly recommended for cleaning oak barrels and for removing excess tannins, and particularly in treating barrels affected by spoilage microorganisms. Store sodium percarbonate solutions in a properly stoppered glass container as hydrogen peroxide tends to break down quickly.