If you still remember something from your middle school science classes, Hydrogen peroxide is the only germicidal agent composed only of water and oxygen. Hydrogen peroxide, chemically represented as H2O2, is one of the most commonly used household disinfectants in the world. If you don’t have a bottle of hydrogen peroxide in your medicine cabinet or under your kitchen sink, you should get one here right now.
People use hydrogen peroxide for sanitizing small cuts and as a stain remover, and there are a lot more you can do with hydrogen peroxide. Organic health has a nice list of 35 reasons why you should have it in your house.