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This attachment will be powerful enough to remove the baking soda without damaging the surface of the mattress. You can also use a handheld vacuum with a smaller attachment head. Once you’ve finished the top of your mattress, flip it upside-down and clean the other side. Sprinkle another 1-3 cups (208-624 g) of baking soda and let it sit in the sun for 24 hours. Vacuum up the baking soda when you’re finished your mattress is completely cleaned. Get in the habit of cleaning your bed with baking soda so it stays fresh and odor-free. Do a clean with baking soda at the beginning and end of the year so dirt and dust does not build up on the surface of your bed.

Summary:
Use the upholstery attachment on your vacuum. Flip the mattress over and repeat the process. Clean the bed with baking soda 1-2 times a year.