How to Clean a Mattress: Stains, Smells, Dust Mites

Short answer: Strip the bed, vacuum the whole surface slowly, spot-clean any stains with the right cleaner for the stain, sprinkle baking soda over the top, leave it for as long as you can, vacuum it off, and let the mattress dry completely before you make the bed.

You need: a vacuum with an upholstery or crevice tool, baking soda, a spray bottle, mild dish soap, white vinegar or hydrogen peroxide, clean cloths, and a fan. Time: about 30 minutes of work, plus a few hours of waiting.

Step 1: Strip the bed and wash everything

Take off the sheets, the mattress protector if you use one, and the pillowcases, and put them straight in the wash on the hottest setting the care label allows. Hot water is what kills dust mites, so this is not the load to run cold. While the bed is bare, open a window. Fresh air does part of the job for you.

Check the mattress tag before you go further. Memory foam, latex and hybrid mattresses should never be soaked, and some makers void the warranty if you use a steam cleaner. Everything in this guide works on all of them as long as you keep the liquid to a light mist.

Step 2: Vacuum the whole mattress

Fit the upholstery tool and go over the entire top surface in slow, overlapping strokes. Slow is the point: dust, skin flakes and dust mite droppings sit down in the weave, and a quick pass only lifts the surface fluff. Then switch to the crevice tool and run it along every seam, the piping around the edge, and the tufted buttons if your mattress has them. That is where most of the dust collects.

If your vacuum has a bagless bin, empty it outside when you are done rather than over the kitchen trash.

Step 3: Deodorize with baking soda

Sprinkle baking soda over the whole surface. You want a thin, even layer, not a snowdrift; a full box is more than enough for a queen. Rub it in gently with a soft brush or your hand so it makes contact with the fabric.

Now leave it alone. An hour helps, a few hours is better, and if you can leave it for the whole day with the window open, do that. Sunlight on the mattress is a bonus, because UV light and dry air both work against mites and smells. When the time is up, vacuum the baking soda off with the upholstery tool, again in slow strokes, and empty the bin.

Step 4: Spot-clean the stains

Treat stains before the baking soda step if they are fresh, or after it if they are old and you are already deodorizing. Either way, the rule is the same: blot, never scrub, and keep the mattress as dry as you can. Work from the outside of the stain toward the middle so you do not spread it.

Sweat and general yellowing. Mix a small squeeze of dish soap into a cup of cool water, mist it on, blot with a clean cloth, then blot again with a cloth dampened in plain water to lift the soap.

Urine. Blot up as much as possible first. Use an enzyme cleaner made for pet or urine stains, following the label, and let it sit for the time it says. Enzymes break down the proteins that cause the smell; soap only masks them. If you do not have one, a mix of equal parts white vinegar and water, misted and blotted, is the next best thing.

Blood. Use cold water only. Warm water sets blood. Dab with a cloth dipped in cold water, then a little hydrogen peroxide on a cloth for what is left. Peroxide can lighten colored fabric, so test it on the underside first.

Vomit or other biological stains. Scrape off anything solid, blot, then use the enzyme cleaner as for urine.

Whatever you use, finish with a plain damp cloth and then a dry one, pressing firmly to pull moisture back out.

Step 5: Dry it completely

This is the step people skip, and it is the one that matters most. A mattress that goes back under the sheets while it is damp inside can start to smell musty within days and can grow mold in the foam. Point a fan at any wet area, keep the window open, and wait until the spot feels dry and room temperature when you press your palm on it. A cold feeling means there is still moisture evaporating. Stand the mattress on its side against the wall if you can, so air reaches both faces.

Step 6: Flip or rotate, then make the bed

While the mattress is bare, rotate it head to foot. If it is a two-sided mattress, flip it as well. Most foam and pillow-top mattresses are one-sided and only need rotating. This evens out the wear and the body dips.

Put a washable mattress protector on before the fitted sheet. It is the single thing that makes the next clean easier, because spills stop at the protector and go in the washing machine instead of into the foam.

Common mistakes

Soaking the mattress. Mist, blot, and keep the liquid on the surface.
Using hot water on blood or protein stains, which sets them.
Making the bed before the mattress is bone dry.
Scrubbing, which pushes the stain deeper and frays the fabric.
Skipping the seams and edges when vacuuming, where the dust actually lives.

Keeping it clean

Vacuum the mattress whenever you change the sheets, or at least every couple of months. Wash the protector monthly. Let the bed air for a few minutes each morning before you pull the covers up, so the night’s moisture can leave. Done this way, a full clean like the one above becomes a once- or twice-a-year job rather than a rescue.

FAQ

How often should you clean a mattress?

A quick vacuum and a baking soda refresh every few months is plenty for most people. Spot-clean spills and stains as soon as they happen, because a fresh stain lifts far more easily than a set one.

Can you use a carpet cleaner or steam cleaner on a mattress?

You can, but go easy. Both push water into the foam, and a mattress that stays damp inside can grow mold. If you use one, make as few passes as possible, pull out as much water as the machine allows, and give the mattress a full day to dry.

Does baking soda really get smells out of a mattress?

Yes, for everyday odors such as sweat. Baking soda absorbs moisture and neutralizes mild acids, which is where most of the smell lives. It will not fix a deep urine or mildew smell on its own; those need an enzyme cleaner and a proper dry.

What is the fastest way to dry a mattress?

Air and time. Stand it on its side if you can, open a window, and point a fan at the damp patch. A hair dryer on the cool or low setting helps with a small spot. Do not put the sheets back until the spot feels dry and cool to the touch, not just dry on the surface.