You probably already have a box of baking soda in your fridge for odor control and in your pantry for baking. It may even be in your toothpaste and in eco-friendly cleaners. It's an all-purpose, non-abrasive gal Friday. And what you might not have known is that you should be using it to clean and exfoliate your skin, too. In fact, some of the expensive in-office (or at the spa) microdermabrasion treatments contain sodium bicarbonate. And sodium bicarbonate is nothing more than baking soda. Just add a teaspoon (less if you have sensitive or mature skin) to your every day facial cleanser to turn your morning wash into a spa-worthy treatment.