Put a tiny bit of toothpaste into a small cup, mix in one teaspoon baking soda plus one teaspoon of hydrogen peroxide, and half a teaspoon water. Thoroughly mix then brush your teeth for two minutes. Remember to do it once a week until you have reached the results you want. Once your teeth are good and white, limit yourself to using the whitening treatment once every month or two. - And to think I almost shelled out $40 at the store for some whitening strips!
How to properly clean your makeup brushes (a tablespoon of white vinegar in a cup of hot water, and a 20 minute soak, followed by a hot, then cold rinse and pat dry will do it. Disinfects, dissolves/makeup, leaves no film, and inexpensive.)