You can use HYDROGEN PEROXIDE to get rid of armpit stains, to clean cookie sheets, as a miracle cleaner in your kitchen and bathroom, and to make your own oxi clean. This stuff is amazingly versatile!
Seriously?! -- Vinegar works as a wood stain when you add a metal object in the mix and let it sit in a glass container for a week. A handful of pennies will produce a beautiful pale Caribbean blue stain. A wad of steel wool will give you a rich reddish hue. A combination of tea and a metal object in vinegar will produce a black stain. Log this away for later.
2 part hydrogen peroxide to 1 part Dawn (original blue) will take the stains out of almost ANYTHING...even if they're old stains! // Mix in a spray bottle and use as a stain remover spray.