Mould on a couch, a mattress or a set of curtains is a different problem to mould on a bathroom wall. Fabric is porous, so the growth goes down into the fibres instead of sitting on top, and most of the advice online is written for tiles.
This guide covers what works on soft furnishings, what damages them, and how to tell when an item is past saving.
Quick answer
- Use white vinegar, not bleach. NSW Health recommends four parts vinegar to one part water. Most DIY guides say 50/50, which is weaker than the health advice.
- Never follow vinegar with bleach. Queensland Health warns the combination produces toxic fumes.
- Check the care code first. A W, S, WS or X tag decides whether water cleans your lounge or wrecks it.
- Apply the 48-hour rule. Porous items wet for more than two days, mattresses and leather included, should be thrown out rather than cleaned.
- If it keeps coming back it is a moisture problem, not a cleaning problem.
Can you actually remove mould from fabric?
Sometimes. It depends on how deep it has gone and what the fabric is made of.
Mould on a synthetic curtain that has been damp for a week will usually come out. Mould through the foam core of a mattress will not. The difference is not effort, it is whether the growth is sitting on the surface or has colonised the material.
Here is the short version. Wash what you can wash, hot, with vinegar. Treat what you cannot wash without soaking it. And accept that some things are finished.
Most people get this wrong in one direction: they scrub a mouldy mattress for two hours, sleep on it, and wonder why they are still waking up congested six weeks later.
Why fabric mould is a different problem to bathroom mould
Mould on tiles sits on top. You wipe it off and it is gone.
Fabric is porous, so the growth sends hyphae down between the fibres. Wiping the surface removes the visible colony and leaves the root structure behind. That is why mould on a couch reappears in the same patch a fortnight later, and why the smell survives a clean that looked successful.
Three things fabric gives mould that a tiled wall does not:
- Cellulose to eat. Cotton, linen, hemp, jute and viscose are food. Polyester is not, but the dust, skin cells and body oils sitting in polyester are.
- Somewhere to hide. Foam, batting and webbing hold moisture long after the surface feels dry to the touch.
- Nobody looks. The underside of a lounge, the back of a bedhead, the bottom hem of a curtain against a cold window. All of it stays out of sight until it smells.
For hard surfaces, walls and ceilings, we have covered the process in detail in our complete guide to removing mould in Australia. This page is about the soft stuff.
How to identify mould on fabric and upholstery
Look for a patch that has texture. Mould is fuzzy, raised and often ringed. A stain is flat.
Colour is a weak signal, but it tells you something about conditions.
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| What you see | Usually means | Typical location |
|---|---|---|
| Black or dark green, fuzzy | Sustained wetting, often weeks | Couch bases, mattress undersides, curtain hems |
| White or grey, powdery | Early-stage growth or mildew | Wardrobes, leather jackets, boxed linen |
| Pink or orange, slimy | Usually Serratia bacteria, not true mould | Damp towels, bathroom-adjacent fabric, laundry left in the machine |
| Yellow-brown speckles | Mould staining that has already set | Stored cotton, vintage upholstery |
| Green with a bloom | Active, spreading, feeding on cellulose | Linen and cotton lounges, sisal, jute rugs |
Pink mould on clothes is the one people misdiagnose most. It is typically bacterial, it wipes off far more easily than true mould, and it is a sign your laundry is sitting wet too long rather than a sign your house has a mould problem.
The smell test is more reliable than the eye test. That earthy, wet-cardboard note means active growth somewhere, even if you cannot see it yet.
“On a lounge, we almost always find it worse underneath than on top. If a customer says they have found a small patch on a seat cushion, I am expecting a much larger colony on the hessian base. Flip the furniture before you decide how big the job is.”
Nick Roth, IICRC-certified Mould Remediation Specialist, AllAces
Read the care code first
Every piece of upholstery sold in Australia should carry a cleaning code, usually on a tag under a cushion or on the base. It is one or two letters and it decides your entire method.
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| Code | Means | Mould approach |
|---|---|---|
| W | Water-based cleaners only | Vinegar solution is safe. Damp, do not soak. |
| S | Solvent only, no water | Do not use vinegar or any water-based product. Dry solvent or professional treatment. |
| WS or SW | Either water or solvent | Vinegar is fine. Test first anyway. |
| X | Vacuum only, no liquid at all | HEPA vacuum, then professional. Any liquid will shrink, ring or watermark it. |
If the tag is missing or illegible, assume S. It is the more expensive assumption and the safer one.
Roughly a third of the mould jobs we see on upholstery arrive already damaged, not by the mould, but by someone applying water to an S-coded fabric. Watermarking on a linen-blend lounge often looks worse than the mould did.
How to remove mould from fabric: the process by material
Machine-washable fabrics: clothes, linen, cotton curtains, loose covers
This is the easy category. Getting mould out of clothes is mostly about heat and dwell time.
- Take the item outside before you handle it. Shaking a mouldy shirt indoors distributes spores through the room.
- Brush off loose growth with a stiff brush, outdoors, wearing a P2 mask.
- Pre-soak in the vinegar solution. Four parts white vinegar to one part water, as per the NSW Health mould fact sheet. One hour minimum. Overnight for heavy growth.
- Wash on the hottest cycle the care label allows. Add a cup of white vinegar to the drum. Skip the fabric softener, it leaves a residue mould feeds on.
- Dry in direct sunlight. Australian UV is genuinely effective here and it is free.
- Check before folding. If any staining remains, repeat step 3 before it goes near a wardrobe.
Do not use bleach as your default on coloured fabric. It strips dye, weakens cotton fibres, and it is mostly water, which means you are delivering moisture into a porous material to kill something that needs moisture to live. Queensland Health notes that household detergents and white vinegar do an effective job when used correctly.
For a fuller walkthrough on garments, including the sequencing for delicate items, see our guide on getting mould out of clothes without wrecking the fabric.
Fabric lounges and upholstered chairs
You cannot soak a couch. The whole method changes.
- Move it outside if you physically can. Sunlight and airflow do half the work.
- HEPA vacuum first, thoroughly. Both sides of every cushion, the base, the crevices. A standard vacuum without a HEPA filter blows spores straight back into the room. Better Health Channel specifically recommends a HEPA-filtered vacuum for mould cleanup.
- Spot test. Under the back, out of sight. Wait twenty minutes and look for colour change.
- Mist, do not spray. You want the fabric damp, not wet. Wet upholstery means wet foam, and wet foam is a mould incubator.
- Dwell for an hour. This is the step everyone rushes. Vinegar needs contact time to work.
- Blot with a clean white cloth. White so you can see what is transferring. Blot, never rub. Rubbing drives the growth deeper and abrades the pile.
- Dry aggressively. Fans, open windows, dehumidifier if you have one. If the piece is not fully dry within 24 hours you have made things worse.
For velvet, chenille or anything with a nap, stop at step 2 and call someone. The pile crushes and will not recover.
Mattresses
Be honest with yourself about this one.
Mould on a mattress is usually a symptom of something structural: condensation under a bed on a slab floor, a slatted base with no airflow, a bedroom that never gets ventilated. The mattress is where it shows up, not where it starts.
Queensland Health is blunt about the threshold. Porous items that cannot be easily cleaned and have been wet for more than two days, mattresses included, should be thrown out.
If the growth is genuinely superficial and recent:
- Strip it and wash all bedding hot with vinegar.
- HEPA vacuum both sides.
- Get it into direct sun for four to six hours minimum, flipping halfway.
- Light mist of vinegar solution, one hour dwell, blot.
- Back in the sun until bone dry.
- Fit a breathable waterproof protector and fix the airflow problem underneath.
If growth has reached the foam core, or the mattress smells after drying, replace it. You spend eight hours a night with your face on it. There is no clever technique that makes a colonised mattress a good idea.
Memory foam and latex are worse than sprung mattresses here, because there is no internal air cavity to dry out. An all-foam mattress with visible mould is almost always a write-off.
Curtains, blinds and sheers
Curtains are the good news story. Most of them come clean.
Washable curtains: unhook, wash hot with a cup of white vinegar, hang in the sun. Iron on the hottest setting the fabric allows. The heat finishes off anything the wash missed.
Sheers: hand wash in a bath, cool water, gentle detergent, then a vinegar rinse. Do not wring them. Hang wet and let gravity pull the creases out.
Blinds: you are not washing these. Equal parts vinegar and water in a spray bottle, wipe each slat with a microfibre cloth, dry immediately. Fabric roller blinds get the mist-and-blot treatment, same as upholstery.
Blockout and rubber-backed: these are the ones that go mouldy most often, because the backing traps condensation against the fabric. Check the backing, not the front. If the rubber has perished and gone tacky, the curtain is done.
And yes, mould on curtains is worth taking seriously. It sits in the airflow of the room at breathing height. NSW Health notes mould exposure can cause runny nose, eye and skin irritation and wheezing, and can trigger asthma attacks in susceptible people.
Leather
Leather behaves differently to everything else on this list. It is a skin, and the mould is usually feeding on the finish and the oils rather than the hide itself, which means it often comes off cleanly if you catch it.
- Take it outside. Wipe visible growth off with a dry microfibre cloth first.
- Mix one part white vinegar to one part water. Leather is the exception to the four-to-one ratio. It does not need the strength, and stronger acid dulls the finish.
- Damp cloth, not a spray bottle. Wipe with the grain.
- Dry immediately with a clean cloth.
- Condition once fully dry. This is not optional. Vinegar strips oils, and unconditioned leather cracks.
Leather jackets, shoes and bags with white bloom usually recover completely. Mould on a leather couch is harder, because the growth is often coming through the seams from the frame and cushioning underneath.
One Australian-specific caution: do not dry leather in the sun. UV that helps a cotton curtain will fade and dry out a leather lounge. Leather furniture near a north-facing window ages twice as fast as it should. Shade, airflow, and keep it away from heat sources.
Queensland Health includes leather goods in the porous-items category that should be discarded after more than two days wet. Flood-affected leather is generally not salvageable.
Vinegar, bleach, clove oil: what actually works
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| Treatment | Works on | Does not work on | Watch out for |
|---|---|---|---|
| White vinegar (4:1) | Most washable fabric, W and WS upholstery, mattress surface | S and X coded fabric, delicate silks | Smell lingers 24 hours, then goes |
| Bleach (250ml in 4L) | White cotton only, hard surfaces | Coloured fabric, wool, silk, leather, anything porous | Never combine with vinegar or ammonia |
| Clove oil | Surface treatment, slowing regrowth | Heavy or established growth | One teaspoon per litre, no more. Stains light fabric |
| Bicarb soda | Odour absorption, moisture pickup | Killing mould. It does not. | Useful as a follow-up, useless as a treatment |
| Hydrogen peroxide (3%) | White and colourfast fabric | Coloured fabric, wool | Test every time. It bleaches |
| Tea tree oil | Small patches, prevention | Large areas, cost-effective use | Expensive. Strong odour some people cannot tolerate |
| Steam | Synthetic upholstery, W-coded fabric | Linen, leather, X-coded fabric | Adds moisture. Only worth it with proper extraction |
The bleach question comes up constantly, so let us settle it. A diluted bleach solution is what NSW Health suggests when mould persists after milder cleaning, and it is fine on a white cotton sheet or a hard surface. On porous coloured fabric it is a poor tool: it removes the pigment from the mould, so the patch looks clean while the organism is still alive underneath, and the water carrier feeds regrowth.
Steam cleaning divides opinion, and it should. On a polyester lounge with a W code and a proper extraction unit behind it, steam is excellent. On linen it is a disaster, and any cleaner who recommends steam for a linen lounge without checking the code is telling you something about their training.
Never mix bleach and vinegar
Queensland Health warns that mixing cleaning agents produces toxic fumes. If you have used vinegar on an item, do not follow it with bleach. Pick one product, use it alone, and work in a ventilated space.
When the item cannot be saved
There is a point where cleaning is the wrong answer, and knowing where that line sits saves people a lot of money and a lot of scrubbing.
Bin it or replace it if:
- It has been wet for more than 48 hours and it is porous. This is the Queensland Health threshold and it is the most useful single rule in mould work.
- The growth has reached foam, batting or a mattress core.
- It has been in contaminated water: sewage, flood water, or grey water from a washing machine overflow.
- The backing has perished, gone tacky or is delaminating.
- Someone in the house has asthma, a respiratory condition, or is immunocompromised, and the item cannot be verified clean.
- You have cleaned it twice and it has come back twice.
That last one matters. Recurrence is not a cleaning failure. It means moisture is still arriving from somewhere and the fabric is just the first thing to show it.
The part most guides skip: it is a moisture problem
You can clean every soft furnishing in the house perfectly and have mould back within a month if the underlying condition has not changed.
Mould needs moisture. Take the moisture away and it stops. That is the whole mechanism.
In Australian homes the usual sources are boring and fixable:
- Condensation on single-glazed windows running down into curtain hems and skirtings.
- Unventilated bedrooms. Two adults breathing overnight in a closed room puts a surprising amount of water into the air.
- Slab floors and low-clearance subfloors, particularly in older Queensland and coastal NSW housing.
- Split-system air conditioners that are never serviced, quietly seeding spores through the room every time you turn them on.
- Clothes dried indoors in winter, which is the single most common cause of wardrobe mould in Melbourne and Ballarat homes.
- Wet season humidity in the tropics and subtropics. The Bureau of Meteorology’s relative humidity climate averages show why coastal Queensland and northern NSW have a different mould baseline to Adelaide or Canberra.
The regulatory picture has caught up with this. Since 2019 the National Construction Code has included Part F8 Condensation management, with the stated objective of safeguarding occupants from illness or loss of amenity caused by excessive internal moisture. Newer builds are meant to handle this. Plenty of Australian housing stock predates the requirement entirely.
If you are renting, this matters legally as well as practically. Persistent mould caused by a building fault is generally the landlord’s problem, not yours, and documented evidence helps.
Practical targets: keep indoor relative humidity under 60%, run exhaust fans for fifteen minutes after showering, leave 100mm of air gap behind wardrobes on external walls, and open the house up on dry days even in winter.
Removing the stain versus killing the mould
Two separate jobs. Most people conflate them and then feel like the clean failed.
Vinegar, heat and sunlight will kill the organism. What they often will not do is remove the pigment mould leaves behind, especially on cellulose fibres like cotton, linen and viscose, where the discolouration bonds to the fibre itself.
If a grey or brown shadow remains after treatment and the fabric is white or colourfast:
- Sunlight over several days does more than any product. Damp the area lightly, put it in full sun, repeat.
- Hydrogen peroxide at 3%, spot tested, is the next step up.
- Oxygen-based laundry soakers work slowly but safely on white cotton. Give them overnight.
- On coloured fabric, accept it or hide it. Chemical stain removal on dyed cellulose almost always takes the dye with it.
We tell customers this before we start, because it manages the disappointment. We can make it safe and we can make it not smell. We cannot always make it look new.
When to call a professional
There is no prize for doing this yourself if the situation is beyond a spray bottle.
Bring in a professional when:
- The affected area is larger than about one square metre.
- The upholstery is S or X coded, antique, or a fabric you would be upset to damage.
- The mould followed water damage or flooding, where moisture may still be in the structure.
- Someone in the household is at risk: asthma, allergies, immunosuppression, pregnancy, or very young children.
- You need documentation for an insurance claim or a rental dispute.
- It has come back after you cleaned it.
Professional mould work in Australia follows the ANSI/IICRC S520 Standard for Professional Mould Remediation, which covers containment, worker safety, cleaning method and post-remediation verification. That last part is the difference that matters. A proper job ends with verification that the mould is actually gone, not just a technician’s assurance.
The practical difference on soft furnishings comes down to equipment. Hot water extraction pulls contaminated moisture back out instead of leaving it in the foam, HEPA air scrubbing captures airborne spores during the work, and moisture meters and thermal imaging find the wet material behind the visible problem.
Relevant services: upholstery cleaning for lounges, chairs and delicate fabrics, mould removal and remediation when growth has moved beyond the furniture, mould inspection and testing to find the source before you spend money, carpet steam cleaning and rug cleaning for the flooring affected by the same conditions.
Frequently asked questions
Does vinegar actually kill mould on fabric?
Yes, for most household species, provided the concentration and contact time are right. NSW Health recommends four parts white vinegar to one part water. The 50/50 mix repeated across most DIY guides is weaker than the health advice and is a common reason mould returns. Give it at least an hour of dwell time before you wash or blot.
Can mould be removed from a mattress, or should I replace it?
Replace it in most cases. Queensland Health advises that porous items wet for more than two days, mattresses included, should be discarded. Surface growth caught within a day or two can be treated with HEPA vacuuming, direct sunlight and a light vinegar mist. If the smell survives drying, or growth has reached the foam, the mattress is not salvageable.
Is mould on curtains dangerous?
It can be a problem, particularly for people with asthma or allergies. NSW Health lists runny or blocked nose, eye and skin irritation and wheezing as common effects, and notes mould can trigger asthma attacks. Curtains sit in the room’s airflow at breathing height, which makes them worth dealing with promptly rather than leaving until the next clean.
Will mould stains come out of coloured fabric?
Often not completely. Killing the mould and removing the stain are separate problems, and on cotton, linen and viscose the pigment bonds to the fibre. Sunlight over several days is the safest option on colourfast material. Hydrogen peroxide and oxygen soakers work on whites. On dyed fabric, aggressive stain removal usually takes the dye with it, so the realistic goal is safe and odour-free rather than visually perfect.
Key takeaways
- Check the care code before anything else. W and WS take water, S and X do not.
- Vinegar at four parts to one part water, one hour dwell. Not 50/50.
- Never follow vinegar with bleach. The fumes are dangerous.
- Porous items wet for more than 48 hours should be replaced, not cleaned.
- Dry fast and completely. Sunlight is the best tool you own, except on leather.
- Killing the mould and removing the stain are two different jobs, and the second one does not always succeed.
- If it comes back, fix the moisture. The fabric was only the first thing to show it.
Related guides
Leather is the one material on this page that needs its own rules, and two problems come up far more often than mould does.
- Avoiding leather furniture sun damage: why UV that helps a cotton curtain will fade and crack a leather lounge, and how often to condition.
- Cleaning white leather furniture: white and light finishes show yellowing and bloom before anything else does.
- Getting mould out of clothes without wrecking the fabric: the garment-specific version of the washable-fabric method above.
- How to remove mould in Australia: the whole-home guide for walls, ceilings and hard surfaces.
The bottom line
Check the care code. Use vinegar at four to one, not 50/50. Never follow it with bleach. Dry the item fast and completely, ideally in the sun. Apply the 48-hour rule honestly to anything porous, and fix the moisture source or you will be doing this again before Christmas.
Most fabric mould in Australian homes is a ventilation problem wearing a cleaning problem’s clothes. Sort the airflow and the humidity and the rest becomes maintenance.
