How to Deep Clean a Mattress

Materials

• 1 cup White vinegar, distilled (Essential for organic stains; plain white vinegar only, not cleaning vinegar which is too strong) — $2 - $4
• 1-2 boxes (4-8 oz each, depending on mattress size) Baking soda, food-grade (Buy standard baking soda, not a commercial deodorizer; it's cheaper and just as effective) — $1 - $3
• 1 tablespoon from existing supply Dish soap, mild (Dawn or equivalent) (Use what you already have; this is just for the mixed cleaning solution) — $0 (from home supply)
• 1 Spray bottle, empty (A clean repurposed bottle works fine; capacity doesn't matter as you'll refill as needed) — $1 - $3
• 3-4 pieces Clean white cloths or towels (Old white t-shirts or cleaning rags work perfectly; avoid dyed cloths that might transfer color) — $0 (from home supply)

Step by step

1. Saturday Morning · Prep

   Strip and vacuum both sides

   Remove all bedding and set it aside for washing. Use a handheld vacuum or upholstery attachment on a full-size vacuum to work across the entire top surface in overlapping passes. Flip the mattress and vacuum the bottom side the same way. Don't rush—spend 3-4 minutes per side to pull up settled dust and debris.

   Tip: Vacuum in straight lines following the mattress quilting pattern; you'll catch more dust than random passes.
2. Saturday Morning · Treatment

   Target every stain first

   Look across the mattress in natural light for any discoloration—old spills, sweat stains, or marks. For organic stains (urine, blood, sweat), mix equal parts white vinegar and water in a spray bottle. For food or other stains, use a solution of one tablespoon dish soap, one tablespoon white vinegar, and two cups warm water. Spray the stain lightly, let it sit for 5-10 minutes, then blot with a clean white cloth. Repeat if needed, working from the outside edges toward the center to avoid spreading.

   Tip: Test any cleaner on a hidden corner first; some mattress fabrics can discolor or weaken with harsh cleaners.
3. Saturday Late Morning · Deodorizing

   Blanket with baking soda

   Once stains are treated and damp areas have mostly dried, sprinkle a thin, even layer of baking soda across the entire top surface of the mattress. Use about half a box (roughly 1-2 cups) for a queen mattress. Let it sit for 30 minutes to an hour. The longer you leave it, the more odor it absorbs. Flip the mattress and repeat on the bottom side.

   Tip: Add 10-15 drops of essential oil (lavender or lemon work well) to the baking soda before sprinkling for scent without chemicals.
4. Saturday Afternoon · Cleanup

   Extract every baking soda trace

   Use your vacuum's upholstery attachment to remove all baking soda from the top surface. Go slowly and make multiple passes—baking soda residue left behind feels gritty and defeats the purpose. Flip the mattress and vacuum the bottom the same way. This step takes longer than you'd expect, but it's essential.

   Tip: If your vacuum has a HEPA filter, now is a good time to check it; baking soda can clog filters quickly.
5. Saturday Afternoon · Airing

   Let the sun finish it

   Prop the mattress upright outdoors in a sunny location, or lean it against a wall where it gets 4-6 hours of direct sun exposure. Sunlight kills remaining bacteria and mites while drying out any residual moisture from cleaning. If outdoor space isn't available, place it near a sunny window indoors. Avoid humid or damp conditions—the point is dry, direct light.

   Tip: Schedule this during the sunniest part of the day; UV light does the real antimicrobial work, not just warmth.
6. Saturday Evening · Finishing

   Cool and settle before bed

   Once the mattress has aired, bring it back indoors and let it rest flat or on its side in the bedroom for 30 minutes before returning it to the frame. This prevents condensation from forming underneath and lets the interior temperature normalize. Make your bed with clean sheets and pillowcases, then let it sit undisturbed for a few hours before sleeping on it.

   Tip: If you notice any lingering odor after a week, repeat the baking soda step alone—you don't need to wash everything again.
7. Ongoing · Prevention

   Guard against future buildup

   Going forward, vacuum your mattress once a month and use a mattress protector to keep spills and dust out. Protectors are inexpensive and removable, and they extend mattress life by years. Rotate or flip your mattress every 3 months if it's double-sided, or every 6 months for modern single-sided designs. A full deep clean like this one should happen every 6-12 months depending on use.

   Tip: A washable mattress protector costs $20-40 and prevents most of the problems that require deep cleaning.