How to clean sweat stains from a mattress — those slowly-spreading yellow marks — comes down to one cheap, slightly magic paste: hydrogen peroxide, baking soda, and a drop of dish soap. It lifts the yellowing that ordinary cleaners leave behind. Here's the exact recipe, plus the one habit that stops the stains forming at all.
Mix about 1 cup 3% hydrogen peroxide, 3 tablespoons baking soda, and a single drop of dish soap into a loose paste. Make it fresh — peroxide loses its punch once mixed.
Clear off dust and dead skin with the upholstery attachment so the paste works on the stain, not the surface grime.
Spread a thin layer over the yellow marks. Don't soak the mattress — a light, even coat is all you need.
Leave it for 30 minutes to an hour until it dries to a crust. This is where the lifting happens, so don't rush it.
Scrape off the dried paste and vacuum up every bit of residue. The yellowing should be dramatically lighter.
Wipe any leftover residue with a barely-damp cloth. Deep, old yellowing may need a second round — that's normal.
Air-dry the mattress completely (a fan or open window helps) so you're not sealing in moisture.
Sweat stains are almost entirely preventable. A washable mattress protector takes the sweat instead of the mattress — wash it monthly and the yellowing never starts. Keeping the bedroom cool also helps; see our cool-bedroom tips for hot sleepers.
More: the full how to clean a mattress routine · urine · blood. If the yellowing is decades deep, it may be time for a new mattress.
Practical stain-removal tips — not medical advice.
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