Your mattress collects dust, sweat, and allergens over time. Once a month, sprinkle baking soda generously across the surface and let it sit for at least 30 minutes to absorb odors. Vacuum thoroughly using an upholstery attachment. For stains, spot clean with mild detergent and warm water—never soak the fabric. Rotate your mattress every three to six months to promote even wear and extend its life.