How to clean a mattress without wrecking it
You clean the surface of a mattress and you keep the inside dry. Vacuum it, blot marks with a few drops of mild detergent in water, deodorise with baking soda, then let it dry completely. There is no safe way to wash the thing through, and the makers say so in their own care documents.
That puts the most popular advice online in an awkward position. Spraying a mattress with vinegar and water is the tip you will meet most often, and PlushBeds' care instructions name vinegar as something never to put on latex. Tempur-Pedic is blunter still: its material, it says, should never become wet.
Meanwhile Purple and Casper publish wet methods on their own blogs. The disagreement is not really between brands, it is between the documents a company writes to protect a product and the articles it writes to attract readers.
What the makers actually publish
We read five documents from mattress companies and set them side by side. Three are care or warranty documents, the kind a company writes when it is on the hook for the product. Two are blog posts from mattress brands, the kind written to be found in a search like this one.
They do not agree, and the line they split along is the type of document rather than the badge on the mattress.
| Source | Type | On wetting the mattress | On the warranty |
|---|---|---|---|
| Tempur-Pedic, product care page | Care document | Never. "TEMPUR material should never become wet" and "Never wash the TEMPUR material" | Not stated on this page |
| PlushBeds, use and care instructions | Care document | Spot clean with a few drops of mild detergent in a cup of water, then air dry. No vinegar or solvents on latex | Not stated on this page (a separate warranty page covers it) |
| PlushBeds, mattress warranty | Warranty document | Not addressed as a method | Excludes "failure to keep the mattress clean and free from stains", and excludes mould, odour or discolouration from spills or poor ventilation |
| Purple, cleaning blog post | Marketing blog | Recommends a vinegar and water mixture, and hydrogen peroxide and water | Not stated |
| Casper, cleaning blog post | Marketing blog | Recommends two cups of hydrogen peroxide with a tablespoon of dish soap, applied with a damp cloth | Not stated |
Two things stand out. The first is that the strongest prohibition is also the most specific: PlushBeds does not say "avoid harsh cleaners", it says never use cleaning solvents or vinegar directly on the latex or on its mattress cover. Vinegar is exactly what most cleaning advice recommends.
The second is how empty the warranty column is. Three of the five documents say nothing at all about what cleaning does to your coverage, which is worth knowing before you take anyone's word that a particular method is safe.
The routine that follows from it
Nothing here is exotic, and that is the point. Every step is either dry or uses the smallest amount of liquid that will do the job, because the drying is the part you cannot control once the moisture is inside.
Why "deep cleaning" a mattress is the wrong idea. Only the top band, the cover and the first few millimetres, can be cleaned and dried. The comfort layer under it absorbs liquid and dries slowly, and anything that reaches the support core cannot be dried out at all.
Every soaking method is aimed at the two layers you have no way of drying, which is the reason care documents describe blotting and air drying instead of washing.
- Strip the bed and vacuum. Take off every layer, including the protector, and vacuum the bare mattress with an upholstery attachment. This is the only step that removes anything without adding moisture, so do it thoroughly, including the sides and the seams.
- Treat marks with the least liquid that works. Blot, never rub. Use a few drops of mild detergent in a cup of water on a cloth, or an enzyme cleaner for sweat and urine. On latex, detergent and water only: PlushBeds says never to use solvents or vinegar on latex. Wipe with a clean damp cloth and stop there.
- Deodorise with baking soda, not liquid. Sprinkle an even layer of baking soda over the surface, leave it several hours to absorb odour and surface moisture, then vacuum it off completely. This is the popular step that adds nothing wet, which is why it is the safe one.
- Dry it properly before anything goes back on. Let the mattress air dry fully, with a fan pointed at it to speed things up, as Tempur-Pedic advises after a spill. Moisture left inside is what turns a stain into the mould and odour that warranties exclude.
- Put a protector back on. A washable waterproof protector moves the problem to a layer you can actually put in a machine. PlushBeds tells owners to keep one on the mattress during use, and it is the only step here that prevents the next stain rather than treating the last one.
If what you are cleaning is the topper rather than the bed underneath it, the rules tighten again, because a topper is foam or latex with nothing else holding it together. We cover that separately in how to clean a mattress topper.
For the layer that is supposed to take the damage in the first place, see how to wash a mattress protector and whether you need a protector at all.
The stain rule most people get wrong
The common version of this is "a stain voids your warranty", stated flatly and usually without a source. What we actually found is narrower and more useful.
PlushBeds lists two separate exclusions: failure to keep the mattress clean and free from stains, and mould, odour or discolouration caused by spills or poor ventilation. Read together, those catch both halves of a bad night: the spill itself, and a soaking attempt to clean it that never dried out.
Tempur-Pedic's care page, by contrast, does not state a warranty consequence at all. It tells you the material must never get wet and how to blot a spill, and stops there.
We are not going to fill that silence in for them. The honest instruction is to read your own warranty document, because the two we read are not the same as each other and neither is the version that circulates online.
What this page does not answer
Most of what is written about cleaning a mattress is framed as hygiene: sanitising, disinfecting, what is living in the bed. We do not write in that frame. We are a research desk, not a health publisher, and claims about allergens, mites or bacteria are medical territory where we have nothing verifiable to add. If that is your question, it belongs with a healthcare professional rather than a bedding site.
We also did not test any of this. Nothing on this page comes from cleaning a mattress ourselves; it comes from reading what five mattress companies publish and reporting where they disagree. That is the whole basis of the page, and you should weigh it accordingly. Our full method is on our methodology page.
Common questions
Can you deep clean a mattress?
Not in the way the word suggests. A mattress is thick and slow to dry, so anything that wets it properly carries the liquid down into foam or latex you cannot reach or dry. That is why manufacturer care documents describe spot cleaning and air drying rather than washing.
Tempur-Pedic puts it flatly: the TEMPUR material should never become wet. Treat the surface, keep the inside dry, and use a protector so the question comes up less often.
Should you use vinegar to clean a mattress?
Check what your mattress is made of first, because for latex there is a documented answer. PlushBeds’ own care instructions say never to use cleaning solvents or vinegar directly on the latex or on their mattress cover.
Vinegar and water is still the most repeated tip you will find online, and some mattress brands publish it on their own blogs, which is the contradiction worth knowing about before you spray anything.
Does staining a mattress void the warranty?
It depends on the maker, and most say less than you would expect. PlushBeds is explicit: its warranty excludes failure to keep the mattress clean and free from stains, and also excludes mould, odour or discolouration caused by spills or poor ventilation.
Tempur-Pedic’s care page does not state a warranty consequence at all. Read your own warranty rather than assuming, and note that both the stain and a soaking attempt to remove it can sit outside coverage.
What actually gets a stain out of a mattress?
Speed, then the mildest thing that works. Blot rather than rub, as soon as the spill happens, using a few drops of mild detergent in a cup of water on a cloth. For sweat, urine or other protein stains an enzyme cleaner breaks down what detergent leaves behind. Lift what you have loosened with a clean damp cloth and let the mattress air dry completely before bedding goes back on.
Does baking soda clean a mattress?
It deodorises rather than cleans. Baking soda absorbs odour and a little surface moisture, and it is the one popular step that adds no liquid, which is why it is the safest part of the routine. Sprinkle an even layer, leave it for several hours, then vacuum it off thoroughly. It will not remove a mark, so treat stains separately and do not expect the powder to do that job.