Put one cup of baking soda into a lock tight container. Add a few sprinkles of your favorite smelling essential oils and shake to mix. Spread the mixture along the top of your mattress. Let it sit for around 30 minutes and then simply vacuum with the furniture attachment on your vacuum cleaner. These are all natural cleaning agents, that make your home smell good and are good for your health too! Win! Win!! Now your mattress should smell as good as new!