How to Clean a Mattress: Stains, Odors, and Allergens

What Lives Inside Your Mattress

The average person sheds about 1.5 grams of skin cells daily, and a significant portion ends up in your mattress. These dead skin cells are the primary food source for dust mites — microscopic creatures that thrive in warm, humid environments. A typical used mattress can harbor 100,000 to 10 million dust mites, and their waste products are one of the most common triggers for indoor allergies.

Beyond dust mites, mattresses accumulate sweat (the average person perspires about half a pint per night), body oils, and occasionally blood, urine, or spilled beverages. Without regular cleaning, this creates a breeding ground for bacteria and mold that can produce noticeable odors and exacerbate health issues.

Step-by-Step Mattress Deep Clean

1. Strip all bedding and wash sheets, pillowcases, and mattress protector in hot water (130 degrees Fahrenheit or higher kills dust mites)
2. Vacuum the entire mattress surface using the couch and upholstery attachment — cover the top, sides, and all seams where debris collects
3. Sprinkle a generous layer of baking soda over the entire top surface
4. Let the baking soda sit for at least 30 minutes, ideally 2 to 4 hours — it absorbs moisture and neutralizes odors
5. Vacuum up all the baking soda thoroughly
6. Flip or rotate the mattress and repeat on the other side

Treating Common Mattress Stains

Blood Stains

Use cold water only — hot water sets blood stains permanently. Make a paste of two tablespoons of cornstarch, one tablespoon of salt, and one tablespoon of hydrogen peroxide. Apply to the stain, let dry completely, then brush off and vacuum. Repeat if needed.

Urine Stains and Odors

Mix eight ounces of hydrogen peroxide with three tablespoons of baking soda and a drop of dish soap. Spray or pour over the stain and let it sit until completely dry. The enzymes break down uric acid, which is what causes the persistent odor. Vacuum the residue once dry.

Sweat and Yellowing

Combine equal parts dish soap, baking soda, and hydrogen peroxide into a paste. Apply to yellowed areas, gently work into the fabric with a soft brush, let sit for 30 minutes, and blot with a damp cloth. Do not soak the mattress — moisture trapped inside promotes mold growth.

Prevention and Long-Term Care

The best mattress care strategy combines regular cleaning with proper protection:

• Use a waterproof, breathable mattress protector — this is the single most effective investment for mattress longevity
• Vacuum the mattress monthly when you change sheets
• Deodorize with baking soda every three months
• Rotate the mattress 180 degrees every three months to distribute wear evenly
• Open bedroom windows periodically to reduce indoor humidity and air out the mattress

For mattresses that have not been cleaned in years or have persistent odors despite cleaning, professional upholstery cleaning equipment extracts embedded contaminants that surface cleaning methods cannot reach. This deep extraction can extend the usable life of your mattress by several years.