Your published tip for whitening teeth was interesting and reminded me of a whitening tip of my own. But not for teeth! As a beauty and holistic therapist I discovered (quite by accident) a useful method of keeping my all-white uniform sparkling. This is a useful tip for any person who wears white a lot (painter/decorators, chefs, nursery nurses etc....) Use slightly less than your usual detergent and add a nappy sanitizing powder (or diaper sanitizing powder, depending on which side of the Atlantic you live!!) About two rounded desert spoonfuls is adequate for washing by hand in the sink or a small half load in the washing machine. the amount can be doubled if washing a full load in the machine. In Britain, this product markets under proprietary names like "Napisan" or "Nappi-wite" and these days admittedly is not always easy to get hold of since disposable nappies/diapers are far more widely used. However, I find that it's worth looking out for and many large chemist and drugstore chains make it under their own label, too. A similar result can be achieved by adding a net curtain whitener but this works out a little more expensive.

I recently found that my local supermarket were selling off several boxes of this substance cheaply since there was not a lot of call for it in current times and it was old stock. Delighted to find a bargain I bought a large amount which will last me a considerable time.