There are thousands of uses for Baking Soda. One of my favorites is using it to remove product build-up in my hair. I used to buy the expensive clarifying shampoos, until I found out this awesome and cheap version.
Pour about a tablespoon or so into your hand then mix in your regular shampoo. Lather, rinse, then wash your hair with just shampoo. Your hair will feel squeaky clean. I highly recommend following up with conditioner. I do this about once a month. One tablespoon is seriously all it takes to make your hair cleaner.