[Chemical name] sodium percarbonate [Chemical formula] 2Na2CO3·3H2O2 [Common or alternative name] sodium carbonate peroxyhydrate [Source and description] 
A combination of sodium carbonate and hydrogen peroxide in solution, this is often sold as a wood bleach for use on decks and outdoor wood furniture. Available at many hardware and home improvement stores. Sometimes referred to as "oxygenated bleach".