Kevin Kelly's high on OxyPower: "This powder is a non-toxic, non-chlorine bleach. Chemically it works like hydrogen peroxide, which is a  water molecule with an added unstable oxygen. OxyPower is chiefly sodium percarbonate, which is washing soda with additional unstable oxygen. As in hydrogen peroxide, the excitable oxygen bubbles off when it reacts, chemically oxidizing smells, films, germs and stains of all kinds.  But because OxyPower is a dry powder it is far more durable and stable than hydrogen peroxide, easier to concentrate, and cheaper in bulk. (Drugstore hydrogen peroxide is 2% solution; OxiPower is equivalent to 27% peroxide.) Best of all, percarbonate degrades to simple oxygen and washing soda (sodium carbonate). Greenies love it, and it is sold in many environmental friendly stores."