How to Clean a Mattress (and Make It Last Longer)

A mattress is one of the least-cleaned major items in most homes. It collects sweat, skin cells, body oils, dust mites, pet dander, and the occasional spill — and unlike sheets, it doesn't go through the wash every week. A mattress that's never been cleaned in five years contains a genuinely surprising amount of debris.

Cleaning it a few times a year is one of the highest-return chores in the house. It protects your investment, keeps allergens down, and honestly helps you sleep better — a fresh-smelling, breathable mattress feels different under you. Here's the full routine.

Every three months

1. Strip the bed completely and wash sheets, pillowcases, and the mattress protector on the hottest setting the fabric allows. Hot water kills dust mites; warm water doesn't.
2. Vacuum the mattress top and sides with an upholstery attachment. Take your time — slow, overlapping passes lift more than fast ones.
3. Sprinkle a thin, even layer of baking soda across the surface. Let it sit at least an hour; longer is better. Overnight is ideal if you can crash somewhere else.
4. Vacuum again, slowly, to lift the baking soda plus everything it absorbed.
5. Rotate the mattress 180 degrees head-to-foot to even out wear. (If your mattress is one-sided, don't flip it. If it's two-sided — rare on modern mattresses — flip and rotate.)

Spot-cleaning stains

Blot — don't rub — with a clean cloth. Rubbing works stains deeper into the fibers. For most stains, a mix of cold water and a drop of dish soap works. For protein stains like blood or sweat, cold water and a small amount of hydrogen peroxide is more effective — the enzymes in the peroxide break down the protein instead of just diluting it.

Never soak the mattress. Foams and coils don't dry easily, and trapped moisture is what causes mildew and permanent musty odors. Use as little liquid as you can, and follow up with a dry cloth to lift as much moisture as possible. If you can, let the mattress air out in front of a fan for a few hours before remaking the bed.

Deodorizing

Baking soda is the safest, most effective deodorizer for mattresses. For stubborn odors, mix a few drops of an essential oil (lavender, tea tree, eucalyptus) into the baking soda before you sprinkle. Skip anything that leaves residue — no fabric softener sprays, no 'mattress refreshing' sprays that just add fragrance on top of the odor.

The single best thing you can do

Use a mattress protector from day one. It's a $60–$150 accessory that prevents 90% of the problems on this page. A good one is waterproof, breathable, and machine-washable at hot temperatures. It stops sweat and body oils from soaking into the mattress in the first place, which is where the vast majority of odor, staining, and dust-mite habitat comes from.

Most mattress warranties are also voided by staining. Meaning: if you spill wine on a $2,000 mattress at year three and don't have a protector on, the warranty claim for anything else — sagging, defective coils — can be denied. The protector isn't just about cleanliness; it's warranty protection.

When to replace

No amount of cleaning revives a mattress that's structurally worn out. If there's a visible dip, if the foam doesn't rebound after you get up, or if you're waking up sore, you're past the cleaning stage. See our guide on how often to replace a mattress for the full checklist.