Mattress cleaning methods explained: hot-water extraction vs dry-vapor steam vs shampooing vs vacuuming

The four common ways to clean a mattress are hot-water extraction, shampooing, dry-vapor steam and vacuuming (ideally HEPA vacuuming). They differ mainly in two things: how much water they put into the mattress, and whether they remove material or only treat it in place. Extraction sprays solution and vacuums most of it back. Shampooing works detergent into the fabric. Dry-vapor steam delivers heat with a small amount of condensed water and doesn't require detergent. HEPA vacuuming adds no water or heat and removes loose particles. None of them does everything, and the right choice depends on the mattress, what you're trying to remove and what the manufacturer allows.

This guide explains each method in terms of what physically happens to the mattress. It is the reference the rest of the Mattress Cleaning Methods hub builds on, and every defined term links to the hub vocabulary.

The short version

The table is a simplification. A cleaner can run an extractor carefully or carelessly, and a steam cleaner can be well tuned or spit water. But the mechanisms don't change, and the mechanisms are what decide the outcome.

Why the method matters more on a mattress than on a carpet

Most mattress cleaning equipment was designed for carpet, so it helps to see what is different about a mattress.

A carpet is a thin layer of fiber on a backing, on a pad, on a floor. Water that goes in has a short way to travel, and the whole assembly is designed to be walked on, cleaned and dried. The Carpet and Rug Institute's residential standard tells homeowners that carpet should be dry within 12 hours of extraction cleaning.

A mattress is a deep stack of materials (see mattress layers). Under the outer fabric, called the ticking, there is usually a fire barrier, then comfort layers of foam, latex, fiber or wool, then a support core of coils or base foam. Those layers are many inches deep, and there is no drain at the bottom. Water that travels below the ticking has nowhere to go except back up through the surface as it evaporates.

A mattress is also an allergen reservoir. The 2013 AAAAI/ACAAI dust mite practice parameter names mattresses, pillows and bedding as major sources of mite allergen. You also spend hours a night with your face on it. That makes moisture, residue and allergen more important on a mattress than they are on a hallway carpet.

So the question to ask of any method is not "does it clean?" but "what does it put into a deep, glued, undrained stack of materials, and what does it take out?"

Hot-water extraction: what happens to the mattress

Hot-water extraction is the carpet industry's most common professional method. CRI's residential standard defines an extractor as equipment that uses "pressure, water/cleaning solution, and suction" to remove soil, and lists the three common forms: truckmounted, portable and self-contained. It is often called "steam cleaning" in advertising, but the machine sprays hot water, not steam. Even a steam-cleaner maker, Daimer, points out that "carpet steam cleaner" is a misnomer for these machines.

The equipment is built for volume. A Sapphire 370ss truckmount is rated for water temperatures up to 250°F, pressure up to 1,500 psi and flow up to 3.4 gallons per minute. A compact portable extractor marketed for auto detailing and upholstery, the Mytee HP90, is rated at 120 psi and 1.3 gallons per minute. Most of that water is meant to be vacuumed back out. What matters for the mattress is how much isn't.

On carpet, that leftover is measured. CRI's Test Method 118 allows a deep-cleaning extractor to leave up to 8 ounces of water per square yard (271 grams per square meter) and still earn its seal. As an illustration only, if a mattress surface held water at that same rate, a queen-size top panel (about 3.1 square meters) would hold roughly 0.84 liters of water, close to a full liter. That is a carpet benchmark applied to a mattress for scale, not a measurement of any mattress cleaning. We have not found any published residual-moisture measurement for mattresses.

Extraction does some things well. It flushes water-soluble soil out of fabric, and it can rinse its own detergent if the operator uses a clear-water pass, as CRI recommends after in-tank solution. On a removable, washable cover or a thin pillow-top, those are real strengths.

The problem is depth. A wand pulls water from the surface. Water that has already travelled into the comfort layers is beyond its reach, and foam is good at holding it. Purple warns that a carpet cleaner "could overly saturate a memory foam mattress," and Casper's care guide tells owners to be careful not to saturate the mattress because the foam "will soak up water and detergent." We cover the comparison in detail in dry-vapor steam vs carpet extraction for mattresses, and the equipment question in why carpet-cleaning equipment and mattress-sanitation equipment aren't necessarily interchangeable.

Dry-vapor steam: what happens to the mattress

Dry-vapor steam comes from a sealed boiler that heats water under pressure. Because water boils at a higher temperature under pressure, the steam leaves the boiler far hotter than 212°F. It travels through a hose and comes out of a nozzle or a cloth-covered tool as a jet of hot vapor. The full explanation is in what is dry-vapor steam cleaning?

Published equipment specifications give a sense of the range:

• Optima Steamer commercial units run at 8.5 bar (about 123 psi) with boiler temperatures around 174 to 178°C (345 to 352°F). Optima lists the temperature at the gun tip separately, at 135°C on diesel-heated models and 120°C on electric models, per the Steamericas model comparison.
• Ladybug (Advanced Vapor Technologies) lists its 2350 at a peak pressure of 80 psi and a tip temperature of 260°F, per the maker's spec page. It doesn't list a boiler temperature; saturated steam at 80 psi is about 324°F (calculated from steam tables: NIST Chemistry WebBook, Engineering ToolBox).
• Vapor Clean lists its Magnum XP (with vac) at 145 psi (10 bar) with a 356°F boiler temperature, per its product page; these are maker claims.
• Daimer advertises machines up to 150 psi and 360°F in its steam cleaner FAQ.

The key physical fact is latent heat. Steam carries most of its energy as the heat it took to turn water into vapor. When it touches a cooler surface, it condenses and releases that energy all at once. According to standard steam tables, that is about 2,257 kJ per kilogram at atmospheric pressure, roughly six to seven times the energy it takes to heat the same water from room temperature to boiling. That's why steam heats fabric so quickly with relatively little water.

It is also why "dry" steam is never perfectly dry on contact. Steam heats a surface by condensing on it, so every pass leaves some water behind. The marketing claim that dry vapor is "about 5% moisture" refers to steam quality, the share of liquid droplets in the steam as it leaves the machine. Daimer says "as little as 5% water," Vapor Clean says "just 5-6% moisture," and Advanced Vapor Technologies, which makes Ladybug, claims (as reported by Green Lodging News) that only 5% of what comes out of the nozzle is moisture and that its machine uses about 1.5 quarts of water an hour. These are vendor claims. We have not found an independent test that measures steam quality at the nozzle for these products, and the figure says nothing about how much condensate ends up in the fabric. We explain that difference in is dry-vapor steam actually "dry"? and how much moisture does dry-vapor steam use?

Operators can control how much water reaches the surface. Optima's user manual has a moisture control valve and tells users to keep it fully closed on water-sensitive surfaces to minimize surface moisture. Pass speed, nozzle distance and the tool matter just as much.

What dry-vapor steam does not do by itself is remove soil. It loosens and heats. The loosened material still has to be vacuumed, wiped or blotted away. That's why steam is usually paired with vacuuming.

What the research shows about steam

The best-known studies were done on carpet, not mattresses:

• In a 1995 study by Colloff, Taylor and Merrett, carpet squares seeded with mites and treated with a domestic steam cleaner had no live mites at any sampling point over four months, and Der p 1 allergen in treated carpet fell 86.7%, compared with 4.7% in untreated areas.
• Vojta et al. (2001) found that dry steam plus vacuuming kept carpet allergen down for up to 8 weeks, compared with about 4 weeks for intensive vacuuming alone.
• Yu et al. (2009) compared HEPA vacuuming alone with HEPA vacuuming plus dry steam on carpets in 50 homes. Mite allergen fell 80.8% and 85.5% respectively, a difference that was not statistically significant. The authors concluded dry steam added only modestly.

Studies of steam against microbes, such as Tanner (2009), were done on lab test surfaces or hospital hard surfaces. They show that steam vapor can inactivate pathogens quickly on those surfaces. They do not measure what happens inside a mattress, and we don't treat them as if they did.

Shampooing: what happens to the mattress

Shampooing means applying a foaming detergent and working it into the fabric with a brush, a bonnet pad or a rotary machine. Sometimes the foam is extracted afterward; sometimes it is left to dry and vacuumed.

The carpet industry has mostly moved away from it. CRI's residential standard says the rotary method is "NOT recommended" for residential carpet and warns that over-concentrated cleaning solution leaves residue that "will contribute to rapid resoiling." Daimer makes the same point about shampoo residue attracting dirt.

On a mattress, shampoo has two specific weaknesses. First, any residue left in the ticking stays where you sleep. Second, shampooing combines liquid with agitation, which pushes solution deeper than a light wipe would, and a mattress has no clear way to rinse it out. As shampoo-wetted fabric dries, dissolved soil can travel back toward the surface with the evaporating water, a process called wicking, so stains can reappear.

Detergent doesn't add much against dust mites, either. McDonald and Tovey (1992) found that detergents did not improve mite killing in lower-temperature washes. The AAAAI practice parameter notes that rugs that were wet-cleaned or shampooed did not have their mites killed, though allergen was removed. We cover chemistry in detail in does professional mattress cleaning have to use detergent?

Vacuuming and HEPA vacuuming: what happens to the mattress

Vacuuming is the only common method that adds neither water nor heat. It pulls loose dust, skin flakes and allergen-carrying particles from the surface. HEPA vacuuming adds a filter that, according to the EPA, can theoretically remove at least 99.97% of airborne particles 0.3 microns in size, so fine particles are less likely to blow back into the room.

The evidence on vacuuming is honest about its limits. The AAAAI practice parameter says vacuuming "does not remove all live mites," but that mite allergen in the form of fecal particles can be removed. It also notes that frequent vacuuming does not significantly decrease mite numbers. At the same time, the guideline recommends HEPA vacuuming and mattress encasements as part of a dust mite control plan.

Many mattress vacuums now add UV-C lamps. UV-C can inactivate microbes on surfaces it reaches, but how well it works on fabric is uncertain. A 2022 laboratory study by Tomás et al., testing UV-C against SARS-CoV-2, found that porous materials such as bed linen and upholstery needed much higher and more variable doses than hard surfaces. A UV-C lamp passing over a mattress for a second or two doesn't reach inside the fabric, and we have not found published data showing what it achieves on mattresses. See HEPA vacuuming vs steam vs extraction for a head-to-head comparison.

What each method removes, kills or leaves behind

Moisture: the variable that decides most outcomes

If you take one idea from this guide, take this one: the moisture load, meaning the total water a process leaves in a mattress, decides most of what happens next.

Moisture matters for three reasons:

1. Mold and mildew. The EPA's mold guide says wet materials should be dried within 24 to 48 hours, and that if they are, in most cases mold will not grow. A mattress that stays damp longer than that is at risk.
2. Dust mites. Mites drink by absorbing moisture from the air. The AAAAI practice parameter says they need relative humidity above about 65% to thrive and decline below 50%, and recommends keeping indoor humidity between 35% and 50%. A damp mattress is a humid microclimate.
3. Material damage. Tempur UK warns: "There is a high risk that soaking with water or other cleaning fluids will cause irreversible damage" to its material, and "It will also invalidate your guarantee." Saatva notes that mattresses "aren't designed to get wet, especially memory foam."

A mattress can be dry to the touch long before it is dry through. The ticking dries first, because it's exposed to air. Water in the comfort layers has to travel up through foam that blocks airflow and insulates against heat. That's why the full answer to "how long until it's dry?" depends on where the water went, not just how much went in. See why moisture matters when cleaning a mattress and how long should a mattress take to dry after professional cleaning?

Heat: a separate question from moisture

Heat and moisture are related but they are not the same variable, and it's a mistake to judge a method on one alone. We explain this in depth in why heat and moisture have to be considered separately.

The first thing to understand is the difference between boiler temperature and surface temperature. The number on a spec sheet is the temperature inside the boiler. Steam cools as it leaves the nozzle and mixes with room air, and fabric heats only as fast as condensation and contact allow. Optima is one of the few makers to publish both figures: around 175°C in the boiler and 120 to 135°C at the gun tip. We have not found published measurements of how hot mattress fabric actually gets under a moving steam tool.

The second thing is that boiler temperature is set by pressure. In saturated steam, temperature and pressure are locked together:

Values are calculated from standard steam tables and rounded. A published temperature that sits well above the saturation temperature for the published pressure implies a superheater, and is worth asking about.

The third thing is dwell time. Biological thresholds are always a temperature held for a time. McDonald and Tovey found all mites died in water at 55°C or hotter, and the AAAAI practice parameter notes mite eggs die almost instantly at 60°C. On the other side, the same guideline says Der p 1, a major mite allergen, needs 30 minutes at 120°C of dry heat to denature. No steam pass on a mattress holds anything at 120°C for 30 minutes, so heat is not a way to destroy allergen. That's why removal (vacuuming) still matters after steam.

Detergent and residue

Detergent helps water lift oily soil, but whatever isn't rinsed out stays in the fabric. CRI's guidance on detergent residue is clear for carpet: over-concentrated solution leaves residue that speeds re-soiling, and a clear-water rinse is recommended. A mattress is harder to rinse than a carpet, because rinsing means more water.

Not every method needs detergent. Dry-vapor steam relies on heat, and vacuuming relies on airflow. Spot treatments, such as enzyme products for organic stains, are a separate step. Our article on detergent explains when chemistry helps and when it just adds residue, and can you sanitize a mattress without soaking it? covers the low-moisture approach.

What mattress manufacturers say

Manufacturer care instructions are the most important input for any mattress, and they aren't consistent. Here is what five major brands publish:

Two points come out of this. First, every brand warns about water getting into foam, and the two strictest also name heat. Second, the two strictest brands are specific. Tempur says "Do not steam-clean or dry-clean the TEMPUR Material" and that it "should never become wet." Purple's guide describes setting a steam cleaner to 250°F for innerspring and hybrid mattresses, then says "you should not steam clean a memory foam, latex, or adjustable mattress since the heat and water could damage its materials" and "you should not steam clean a Purple mattress." It warns about carpet cleaners separately. Neither brand's text makes an exception for dry-vapor steam.

Sleep Sanitation's position. Both makers advise against steam cleaning, and neither makes an exception for dry vapor. Tempur UK says "Do not steam-clean or dry-clean the TEMPUR Material." and warns "There is a high risk that soaking with water or other cleaning fluids will cause irreversible damage"; "It will also invalidate your guarantee." Tempur-Pedic US adds that TEMPUR material "should never become wet" and that "Due to the temperature-sensitivity of the TEMPUR-material, adding high heat can hinder its ability to react to your body temperature and conform to your body shape." Purple says "you should not steam clean a memory foam, latex, or adjustable mattress since the heat and water could damage its materials" and "you should not steam clean a Purple mattress". We do clean Tempur-Pedic and Purple mattresses. That is our own choice and our own reasoning; it is not an exemption from the manufacturer, and neither maker has approved it. Because heat and moisture are separate variables, we manage both: an Italian-made Vapor Clean dry-vapor steam system keeps water down (Vapor Clean's product page claims "just 5-6% moisture," a maker claim, not a measurement of our equipment), and quick, repeated passes with the tool kept moving keep heat from dwelling in one spot. Nothing is soaked. Following the manufacturer's label is the safe default, and if your mattress is under warranty, check your manufacturer's warranty terms before booking any cleaning. For how steam and extraction differ mechanically, see dry-vapor steam vs carpet extraction for mattresses.

Clean, sanitize, disinfect: using the words carefully

Mattress cleaning advertising uses "sanitize" loosely. The CDC uses three distinct words (see cleaning, sanitizing and disinfecting):

• Cleaning removes dirt and germs from a surface.
• Sanitizing lowers the number of germs to a level considered safe.
• Disinfecting kills germs on surfaces, typically with an EPA-registered product used as labeled.

These are results, not methods. A method can be designed to sanitize, but whether it does on a given mattress depends on the material, the soil and the process. Laboratory studies show steam can inactivate microbes on hard and test surfaces, but we have not found a published study measuring germ reduction on in-use mattresses after steam or extraction.

Be wary of equipment marketing that leans on EPA numbers. Many steam and UV devices carry an EPA establishment number, but the EPA's own consumer guide says that number does not indicate the product has been reviewed for safety or efficacy.

How Sleep Sanitation approaches it

Sleep Sanitation is a mattress-only company in Omaha and Lincoln, and we chose a low-moisture approach because of the mechanisms in this guide. A typical appointment combines dry-vapor steam from our Vapor Clean equipment, applied in quick, controlled passes, with a heated UV-C mattress vacuum, with spot treatments added only where they're needed. The goal is to deliver heat without soaking the comfort layers, remove what can be removed, and leave a bed that, as field guidance from our own jobs rather than a published measurement, is usually dry to the touch the same day in a ventilated room. Every appointment starts with an inspection of the mattress and its materials, and if your manufacturer's care instructions restrict steam or moisture, mention it when you book so we can go over our approach (described above under what mattress manufacturers say) before any treatment.

You can read the step-by-step on our process page, see what's included on pricing, or schedule a visit. If you'd rather talk it through, call or text (402) 512-5658, Monday to Friday, 9am to 6pm.

What we don't know

We would rather say this plainly than fill the gap with marketing:

• Residual moisture in mattresses. We have not found a published measurement of how much water any cleaning method leaves inside a mattress.
• Surface temperature. We have not found published measurements of how hot mattress ticking gets under a moving dry-vapor tool, and most equipment makers publish only boiler temperatures.
• Steam quality at the nozzle. The "5% moisture" figure is a vendor claim. We have not found independent tests of it.
• Mattress-specific outcomes. The best steam studies were on carpet or lab surfaces. A 2001 study by Htut et al. did treat mattresses, but with a specialized combination of hot air at 110°C, steam and heat, not a typical in-home service.
• A mattress cleaning standard. The IICRC publishes standards for carpet (S100) and upholstery (S300). We have not found a consensus standard written for mattresses.

Questions to ask any mattress cleaning company

• Is your machine a hot-water extractor or a steam boiler? What's the make and model?
• How much water goes into the mattress, and how do you control it?
• Do you use detergent? If so, do you rinse it out?
• How do you handle memory foam, latex, wool and adjustable bases?
• What does my mattress manufacturer say about your method?
• How long should I wait before making the bed, and what should I do if it still feels damp?
• Do you vacuum before and after? Is the vacuum HEPA-filtered?

Continue in this hub

Understanding dry-vapor steam

• What is dry-vapor steam cleaning?
• Is dry-vapor steam actually "dry"?
• How much moisture does dry-vapor steam use?
• Steam cleaner vs dry-vapor steam cleaner: are they the same?

Moisture, heat and the mattress

• Why moisture matters when cleaning a mattress
• Why heat and moisture have to be considered separately
• What happens when water penetrates memory foam?
• How long should a mattress take to dry after professional cleaning?

Comparing methods, equipment and chemistry

• Dry-vapor steam vs carpet extraction for mattresses
• Why carpet-cleaning equipment and mattress-sanitation equipment aren't necessarily interchangeable
• Can you sanitize a mattress without soaking it?
• Does professional mattress cleaning have to use detergent?
• HEPA vacuuming vs steam vs extraction: what does each accomplish?