While it's impossible to wash your mattress, this cleaning trick will have it smelling and feeling fresh in no time! You will need Baking soda, Essential oil (optional) and a vacuum cleaner.
Strip the mattress of all bedding. Put a cup of baking soda into a container with a tight-fitting lid, add 4-5 drops of your favorite essential oil (I love lavender!), replace the lid, and shake!
Now sprinkle the mattress liberally with the baking soda mixture. Allow the baking soda to sit on the bed for an hour or two. This allows the baking soda time to soak up any body oils. Then, use the vacuum's furniture cleaning attachment to vacuum up the baking soda. Go over it several times, in different directions, to ensure optimal results.