It's only natural that every once in a while your refrigerator starts to smell, but there's an easy solution to keeping your fridge smelling fresh if you don't have a box of baking soda on hand. Look no further than coffee grounds. (Sure, you could use fresh coffee grounds, but why waste those precious beans?)
The next time you make a cup of Joe, save those wet coffee grounds and spread them on a baking sheet so they dry. Once dry, you've got a natural deodorizer. Put the grounds in an open container (like an uncovered Tupperware or small bowl), and place them in the fridge. The coffee will absorb any unpleasant scents and keep your fridge smelling nice.