Baking soda may work. Lemon juice may also work. Both of these stain removers even work to clean grout and remove rust and build up of mold or bacteria. Baking soda is also great for adding to the washing load for brighter, cleaner clothing -small amounts. Oh yeah, if you want brighter teeth Baking Soda kick ass so we can forget about all those expensive strips and crap. Plus a little baking soda on a teaspoon with a glass of water will help balance your PH. I take it every now and then. It's friggin' magic.