Short answer
Casper's care guide doesn't mention steam. It suggests 'spot-cleaning affected areas with water and mild detergent' but warns 'Be careful not to saturate the mattress with too much water and/or detergent, as the foam in the mattress core will soak up water and detergent.' It also says not to remove the cover. Our dry-vapor method is our own, not a Casper exemption; check your warranty terms first.
Key terms used on this page
- Care instructions (manufacturer care guidance):
- What a manufacturer publishes about cleaning its product: a sewn-in label, a care web page, a help-center article or a brand blog post. They carry different weight. A sewn-in label or a product-care page speaks for a specific product; a blog post often gives general advice about many mattress types. On this hub we name the document type for every quote.
- Memory foam (viscoelastic foam):
- An open-cell, slow-recovery polyurethane foam that softens with body heat and conforms to pressure. Because its cells are open, liquid can travel into it, and because it is dense and insulating, it is slow to dry.
- Polyfoam (polyurethane foam):
- Conventional polyurethane foam, used for comfort, transition and base layers. Like memory foam it has cells that liquid can enter; Casper warns that 'the foam in the mattress core will soak up water and detergent.'
- Dry-vapor steam:
- Steam made in a sealed, pressurized boiler and released through a hose and nozzle as hot vapor with a low liquid-water content. In the vendor specifications we reviewed, professional units are rated from 80 psi (Ladybug 2350) to 150 psi (Daimer), with stated boiler temperatures from about 345°F (Optima) to 360°F (Daimer); these are maker claims. Daimer describes its steam as about 5% water or less and Vapor Clean claims 'just 5-6% moisture'; that is a vendor claim, not an independent standard.
- Adjustable steam output:
- A control on some commercial steam machines that sets how much steam reaches the tool. For example, Vapor Clean describes its Magnum XP (with vac) as having a 'Fully Adjustable Steam Regulator' and a 'Pressure Regulator 0 - Full Range' (maker's claims). We don't publish settings; the technician chooses them for the material.
- Pass speed:
- How fast the steam tool moves across the fabric. A faster pass gives the fabric less time under the tool, so less heat and less condensed water reach any one spot. Purple's general guide makes the same point for home steamers: move 'without leaving it in one spot for too long.'
Casper sells foam and hybrid mattresses with zippered covers. Its care guide is short and doesn't mention steam. It allows spot cleaning with water and mild detergent, and it explains its one big worry plainly: the foam core absorbs liquid.
Not affiliated with or endorsed by any manufacturer listed. Brand names are used only to identify products and their published care instructions.
1. What the manufacturer actually says
The source is Casper's mattress care guide (no date shown; accessed 2 October 2026).
It is hosted on Casper's legacy help site and covers Casper mattresses and covers.
On spot cleaning:
"If you need to clean your Casper mattress or cover, we suggest spot-cleaning affected areas with water and mild detergent."
On saturation:
"Be careful not to saturate the mattress with too much water and/or detergent, as the foam in the mattress core will soak up water and detergent."
On drying:
"Allow the treated area to air dry completely before putting your sheets and bedding back on."
On the cover:
"Do not remove the mattress cover to clean it or the mattress for any other reason."
2. Does it mention steam?
No. The guide doesn't mention steam. Its central warning is about saturation: "the foam in the mattress core will soak up water and detergent."
3. Does it mention dry-vapor steam?
No. Casper's page never names dry-vapor steam. Its cautions on water, soaking, chemicals and covers still apply.
4. The restrictions it states
| Variable | What Casper's page says |
|---|---|
| Water | "spot-cleaning affected areas with water and mild detergent" |
| Soaking | "Be careful not to saturate the mattress with too much water and/or detergent" |
| Heat | Not stated |
| Steam | Not stated |
| Chemicals | Only "mild detergent" named; too much detergent cautioned |
| Covers | "Do not remove the mattress cover to clean it or the mattress for any other reason." |
The guide links a related question that captures the cover rule: "Why do Casper mattress covers have a zipper if I am not supposed to remove the mattress cover?"
Every brand's restrictions sit side by side in the compatibility guide.
5. How dry vapor differs from wet cleaning
Casper's stated concern is saturation: "the foam in the mattress core will soak up water and detergent."
Dry vapor leaves far less water than carpet-style extraction, but heat and moisture are separate variables.
Vapor Clean claims the Magnum XP runs at "just 5-6% moisture" (maker's claim, not our measurement).
The EPA advises drying wet materials within 24 to 48 hours; the hub's drying note explains why.
6. Sleep Sanitation's professional interpretation
This section is our view, not Casper's.
Casper's guidance is the default for owners: spot cleaning with water and mild detergent, no saturation, complete air-drying, a protector, and the cover left on.
Our position: we can sanitize Casper mattresses (the CDC's sense, not disinfection). Casper's warning is about liquid reaching the foam core, so on a Casper we use no detergent, keep the cover zipped, and keep each pass short so moisture stays at the surface.
We run three Italian-made Vapor Clean machines, the Magnum XP, ProV 350 and Pro6 Duo, at low steam output.
Passes stay quick and light. We don't unzip covers, soak the bed, or use bleach or solvents.
This is our method, not a Casper exemption, and Casper hasn't reviewed it. Check your warranty terms before booking.
Casper's 10 Year Limited Mattress Warranty lists what it does not cover. One item:
"Physical abuse or damage to the structure and/or cover material, including but not limited to, burns, cuts, tears, liquid damage, or stains; provided, that the defect is caused by such abuse or damage."
Not legal advice; if you're unsure, ask the manufacturer.
Casper's own cleaning routine
- Spot clean. Water and mild detergent on affected areas.
- Don't saturate. Too much water or detergent soaks into the foam core.
- Dry completely. Before sheets and bedding go back on.
- Protector. A stain and water-resistant protector that can be removed and cleaned.
Other care points on Casper's page
On protectors:
"For an easier method of keeping your mattress clean, we recommend using a stain and water-resistant mattress protector (available for purchase on Casper's website here ), which may be removed and cleaned as needed."
Before a visit to a Casper bed
Casper's guide sits on its legacy help site, so check whether your model came with its own card or label. Casper's warning is about foam soaking up "water and detergent," which is why our visit uses no detergent and keeps the vapor moving across the cover.
The zipper on a Casper cover is not an invitation; the guide says not to remove the cover "for any other reason," and the warranty excludes liquid damage and stains. If you have an older spill, tell us roughly when it happened and whether anything was sprayed on it, so the technician knows what is already in the foam.
Casper's spot-cleaning steps are worth following between visits: water and a mild detergent, no saturating, and letting the area air dry completely before the sheets go back on. Its reason, that the foam core will soak up water and detergent, is the same reason we keep vapor moving.
If the bed is on Casper's own foundation or base, leave it there; we clean the mattress where it stands and don't need to lift it off.
Common misreadings
"The zipper means the cover comes off for washing." Casper says not to remove the cover "for any other reason."
"Not mentioned means permitted." No. Casper doesn't mention steam either way. Silence is a gap in the guidance, not a permission.
How Casper compares with the other brands we checked
Casper is not among the five brands whose care pages mention steam. None of the 21 pages we checked mentions dry vapor.
Casper's page addresses 4 of the six variables in section 4; it is silent on heat and steam.
Its water wording, for comparison: "spot-cleaning affected areas with water and mild detergent".
The compatibility guide lines up all 21 pages, from Tempur-Pedic's strict water rule to the brands that tie care to warranty.
Your label and warranty
Your sewn-in label speaks for your model and outranks Casper's web page. Use the hub's label checklist before any cleaning.
Where this fits
- Materials: memory foam, hybrid.
- Related brands: Nectar and Purple; the full table is in the compatibility guide.
- Visits: read our process, check pricing, or schedule a visit.
Related guidance and background
How other manufacturers word the same issue, for comparison:
- Sleep Number. "Use only a little water—just enough to lightly dampen the spot" (Sleep Number).
- Tempur-Pedic (US). "TEMPUR® material should never become wet" (Tempur-Pedic).
- Avocado. "Steam cleaners are not recommended because their excessive heat can over-bake the organic latex" (Avocado).
What we don't know
- Legacy page. The guide sits on Casper's legacy help site; a newer page may exist that we didn't find.
- Hybrid models. The guide doesn't separate foam and hybrid models.
- Dry-vapor steam. Casper hasn't addressed it on the page we quote.
- Changes. Care pages change; we read Casper's page on 2 October 2026 and will update this page if it changes.
Changelog
- 2 October 2026: First published. Casper's page accessed on this date.
- 2 October 2026 (later): Added Casper's warranty document, accessed on this date.
Sources
- How to clean your mattress: a mattress care guide (accessed 2026-10-02) · Casper
- Casper Sleep 10 Year Limited Mattress Warranty (no date shown; accessed 2026-10-02) · Casper
- Cleaning Your Mattress (support, accessed 2026-10-02) · Sleep Number
- Product care (US, accessed 2026-10-02) · Tempur-Pedic
- How to Clean Your Natural Mattress Without Using Harsh Chemicals (25 June 2026, accessed 2026-10-02) · Avocado
- Magnum XP-Vac product page (maker's claims, accessed 2026-10-02) · Vapor Clean
- ProV 350 product page ('Italian Made'; maker's claims, accessed 2026-10-02) · Vapor Clean
- Pro6 Duo product page ('Made in Italy'; maker's claims, accessed 2026-10-02) · Vapor Clean
- Cleaning and disinfecting your school (definitions) · CDC
- A brief guide to mold, moisture and your home · US EPA
Last reviewed October 2, 2026. Manufacturer specifications and care instructions change; check the current version for your exact model. This page is general information, not medical advice. How we source and check pages: editorial standards.