How to Deep Clean a Mattress: The Thorough Method for a Truly Fresh Bed

A basic mattress clean removes surface dust and light odors. A deep clean goes further — eliminating embedded allergens, killing dust mites, neutralizing deep-set odors, and treating stains that have been there for months. This guide covers the full deep clean process for a truly fresh mattress.

What You'll Need

• Pressurized Handheld Steam Cleaner — the most effective tool for deep sanitizing; high-temperature steam penetrates mattress fabric to kill dust mites, bacteria, and allergens
• Rocco & Roxie Oxy Stain Remover Spray — oxygen-powered formula for lifting embedded stains
• Rocco & Roxie Enzyme Stain & Odor Eliminator — for organic stains and deep-set odors
• Nutricost Baking Soda (2 lbs) — for deep deodorizing
• The Ecology Works Dust Mite Allergy Spray — plant-based dust mite reducer for bedding and mattresses
• Amazon Basics Microfiber Cleaning Cloths (24-pack)
• Vacuum with upholstery and crevice attachments

When Does a Mattress Need a Deep Clean?

• You or a household member has been ill
• There are persistent odors despite regular cleaning
• Allergy symptoms are worse in the bedroom
• The mattress hasn't been cleaned in over 6 months
• After a significant spill or accident
• When moving into a new home with an existing mattress

Step 1: Full Vacuum — Top, Sides, and Bottom

Strip all bedding and vacuum every surface of the mattress thoroughly:

• Use the upholstery attachment for flat surfaces
• Use the crevice tool for seams, edges, and tufted areas
• Flip the mattress and vacuum the underside as well
• Vacuum the bed frame, slats, and headboard while the mattress is off

Take your time — slow, overlapping passes remove significantly more debris than quick passes.

Step 2: Treat All Stains

Identify every stain and treat appropriately:

• General stains: Spray Rocco & Roxie Oxy Stain Remover, let sit 5 minutes, blot clean
• Organic stains (urine, blood, sweat): Apply Rocco & Roxie Enzyme Cleaner, let sit 15–20 minutes, blot clean
• Old set-in stains: Apply enzyme cleaner generously, cover with plastic wrap to slow evaporation, let sit 30–60 minutes, blot clean

Allow all treated areas to dry before proceeding to the next step.

Step 3: Deep Deodorize with Baking Soda

1. Sprinkle baking soda very generously over the entire mattress — use the full 2 lb bag for a queen or king mattress
2. Add 10–15 drops of lavender or tea tree essential oil to the baking soda before applying for extra antimicrobial benefit
3. Let sit for a minimum of 4 hours — overnight is ideal for a true deep deodorize
4. Vacuum up all baking soda thoroughly with multiple slow passes

Step 4: Steam Clean the Entire Surface

The handheld steam cleaner is the most powerful tool for deep mattress sanitizing. Steam at 212°F+ kills dust mites, bacteria, mold spores, and allergens on contact.

1. Move the steamer slowly across the entire mattress surface in overlapping rows
2. Hold 1–2 inches from the surface for maximum penetration
3. Pay extra attention to seams and edges where dust mites concentrate
4. Steam both sides of the mattress for a complete deep clean
5. Allow to dry completely — at least 2–4 hours with fans and open windows

Step 5: Apply Dust Mite Treatment

After the mattress is dry, spray The Ecology Works Dust Mite Allergy Spray over the mattress surface. This plant-based formula denatures the proteins in dust mite waste that trigger allergic reactions, providing ongoing protection between deep cleans. Allow to dry before making the bed.

Step 6: Protect Going Forward

After a deep clean, install a PlushDeluxe Waterproof Bamboo Mattress Protector. This creates a physical barrier against future stains, moisture, and dust mites — keeping your deep-cleaned mattress fresh for much longer.

Frequently Asked Questions

How long does a mattress deep clean take?

The active cleaning time is 1–2 hours. However, the baking soda should sit for at least 4 hours (overnight is better), and the mattress needs 2–4 hours to dry after steaming. Plan for a full day — start in the morning so the mattress is ready by evening.

Can I deep clean a memory foam mattress?

Yes, but with extra care around moisture. Memory foam absorbs liquid easily and takes longer to dry. Use minimal moisture during stain treatment, and ensure thorough drying after steaming. See our dedicated memory foam mattress cleaning guide for specific instructions.

How do I know if my mattress has mold?

Signs of mattress mold include dark spots (black, green, or brown) on the surface, a persistent musty smell that doesn't go away after cleaning, or increased allergy symptoms. If you find significant mold, the mattress may need professional treatment or replacement.