Memory foam
An open-cell foam that holds any liquid it takes in and dries from the inside outwards. The manufacturer's instruction is not a cleaning method — it is that it should never get wet.
What not to do
Water is unsafe on Memory foam
Unsafe
Do not do this. The risk is established, and it is described below.
The manufacturer leads with this rather than with a method. An open-cell foam takes in whatever is used on it and dries from the inside outwards.
Evidence
Supported
Sources
Tempur Sealy International · Manufacturer documentation
Relied on for: That mattresses should never get wet, that a mattress which does get wet is towelled to remove excess moisture and then air-dried, and that stain cleaning is mild soap with cold water applied lightly and only if unavoidable. (states this directly)
Water is unsafe on Memory foam
Unsafe
Do not do this. The risk is established, and it is described below.
Already true of mattresses, and this is a second body saying it for a different product made of the same material.
Evidence
Strongly supported
Sources
How To Wash Pillows At Home Like an Expert
Bed Advice UK — The National Bed Federation · Trade or professional body
Relied on for: That foam pillows should be cleaned by wiping them rather than washed, in a document that permits machine washing for every other filling it names. (states this directly)
Tempur Sealy International · Manufacturer documentation
Relied on for: That memory foam should never get wet and that an item which does get wet is towelled to remove excess moisture and then air-dried. (states this directly)
In detail
Memory foam is what most modern mattresses, toppers and a growing share of pillows are made of, and it inverts the usual relationship between a soil and a treatment. The problem is not lifting the mark; it is that the material will absorb whatever is used to lift it, and then hold it. The mattress manufacturer's care guidance leads with a prohibition rather than a method: mattresses should never get wet. Where one does, the instruction is a towel to remove excess moisture and then AIR DRYING — not heat, not extraction. Stain treatment is granted grudgingly and narrowly: if you must, mild soap with cold water, applied lightly. Dry-cleaning fluid of any type is excluded outright on any mattress. Routine care is therefore not cleaning at all. It is vacuuming the bare surface, and washing or replacing the cover — the protective layer is the thing that gets laundered, and the foam is the thing that is kept dry. No foam-specific evidence covers toppers and pillows sold on their own, or covers machine washing them.
Properties
Sensitivity
- Heat
- Not addressed by the sources
- Abrasion
- Not addressed by the sources
- Porous
- Sensitive
“Not known” means nobody has established this, not that the material is unaffected.
What works
Dry soil removal is safe on, in specific conditions, Memory foam
Safe only in specific conditions
This is only appropriate within specific limits. Outside those limits, no claim is made.
Only within these limits:
- GENTLY, and on the top surface only
- Dry suction. The never-wet rule for an absorbent foam core is unchanged by this
- An upholstery attachment rather than a beater bar
The only cleaning a bed trade body clears for a mattress, and it is cleared because it introduces no moisture at all — which is the single thing an absorbent core cannot deal with.
Evidence
Supported
Sources
Bed Advice UK — The National Bed Federation · Trade or professional body
Relied on for: That the top of the mattress should be gently vacuumed from time to time, alongside using a protector and airing regularly. (states this directly)
Why
- Memory foam is explained by Capillary absorption
Where the sources disagree
A mattress has been stained. Cold water and mild soap only, or the trade body's warm detergent and solvent?
Part of this is scope and part of it is not. THE SOLVENT DIFFERENCE IS PARTLY SCOPE. The manufacturer writes for a range in which foam is usual, and foam has least tolerance for a solvent and no way to flush one out. The trade association writes across UK beds including sprung ones, and it does not ignore the problem — it attaches 'cautiously on foam' to the same instruction. The more foam is present, the closer its advice moves to the prohibition. THE TEMPERATURE DIFFERENCE IS NOT SCOPE. Warm and cold are not two readings of one instruction; they are opposite answers about the same sponge on the same stain, and no construction difference explains it. It stands unresolved. What neither disputes is the more useful part: act immediately, do not over-wet, and get the liquid out of the mattress's path first. Standing the mattress on its side is the only step in either document that changes the outcome rather than the appearance, and the manufacturer contradicts nothing in it.
What to do: Do the two things both bodies support first, because they are the ones that matter: strip the bedding and stand the mattress on its side so the spill stops travelling, then lift what you can with cold water and no flooding. After that, let the construction decide. On a foam or foam-topped mattress take the manufacturer's line — cold, mild soap, light, and no solvent at all. On a sprung mattress the trade association's warm detergent procedure is a credible body's published instruction and is available to you. Whichever you use, the limit is the same: what has soaked below the surface is not reachable by anything applied to the surface, which is why both documents end up recommending a protector rather than a technique.
The sources genuinely disagree
Sources for this page
Sources
Tempur Sealy International · Manufacturer documentation
Relied on for: That mattresses should never get wet, that a wet mattress is towelled and then air dried, that stain cleaning is mild soap with cold water applied lightly and only if necessary, that dry-cleaning fluid of any type must not be used on any mattress, and that routine care is vacuuming plus washing or replacing the cover. (states this directly)