# How to Remove a Mould Stain from Fabric

> Mould on clothes, sheets or curtains: safe methods by fabric type, musty odour removal and prevention.

**Published :** 2026-03-20 · **Updated :** 2026-04-25

---

**Résumé :** **In short:** mould is not just an aesthetic problem — it is a
**living organism** that releases spores and mycotoxins. To
remove it from fabric: brush the spores off dry outdoors, pre-treat according
to the textile (percarbonate, white vinegar or [Marseille soap](https://amzn.to/48721mK)), then wash at
**60 °C minimum**. Complete drying is essential to prevent any
recurrence.

## At a glance

- **Always brush dry outdoors first** — mould spores disperse in the air; never release them indoors.
- **Pre-treat before washing** — a 40 °C cycle alone will not remove the pigment. Sodium percarbonate is the most effective product on white cotton.
- **Wash at 60 °C minimum** — this is the temperature that kills mould spores. 90 °C for heavily contaminated household linen.
- **Dry completely** — in the tumble dryer or in the sun. A still-damp textile stored away means guaranteed mould.
- **Discard if heavily contaminated** — a textile that still smells musty after 2-3 complete treatments is irredeemably contaminated.

## Mould: why it is a health concern

Moulds are **microscopic fungi** that develop on organic matter in the presence of moisture. On textiles, they find an ideal environment: natural fibres (cotton cellulose, wool keratin), sweat residue, detergent remains — all this constitutes a nutritive substrate.

The issue goes beyond a simple stain. Moulds release two types of potentially harmful substances:

- **Spores** — microscopic particles that disperse into the air at the slightest movement of the textile. Inhaled, they trigger allergic reactions: rhinitis, sneezing, irritated eyes. In sensitive individuals, they can trigger or worsen [asthma](/en/blog/dust-mite-allergy-laundry/index.md).
- **Mycotoxins** — secondary metabolites produced by certain species (Aspergillus, Stachybotrys). Prolonged skin contact with a contaminated textile can cause irritation, dermatitis, or more marked reactions in immunocompromised individuals.

> Wearing a slightly mouldy garment once will not cause a serious illness.
> However, **prolonged or repeated exposure** (mouldy sheets,
> regularly worn untreated garments) can sustain chronic allergic symptoms.
> Infants, asthmatic individuals and immunocompromised people are the most
> vulnerable.

This is why merely "masking" the stain is not enough: you must **kill the fungus, eliminate the spores and remove the odour** — three distinct objectives that each require a specific action.

## Black vs white vs green mould

Not all moulds are equal. The colour gives an indication of the type of fungus and the severity of the contamination.

| Colour | Common fungus | Severity | Common cause |
|---|---|---|---|
| White / light grey | Mucor, Penicillium | Moderate — early stage | Laundry left damp 24-48 h (basket, drum) |
| Green / blue-green | Aspergillus, Cladosporium | Medium — established contamination | Textile stored in a damp wardrobe, cellar, garage |
| Black | Stachybotrys, Alternaria | High — old, deep | Water damage, textile forgotten for weeks/months |

**White mould** is the easiest to treat: the fungus is on the surface and has not yet deeply pigmented the fibres. A simple [percarbonate](https://amzn.to/4lR6akp) soak followed by a 60 °C wash is often sufficient.

**Black mould** is the most stubborn. The pigment (fungal melanin) penetrates deep into the fibres and resists standard treatments. It often takes 2-3 pre-treatment cycles. If the textile still smells musty after the third pass, it is probably beyond saving.

## Stain removal protocol

Mould treatment always follows the same order, regardless of the textile. Each step has a specific objective — do not skip any.

### 1. Brush the spores off dry

**Objective**: remove as much fungal matter as possible before contact with water.

Take the textile outside (balcony, garden). Use a soft-bristle brush (clothes brush, old toothbrush for small areas) and brush the stain. The spores fly off — this is precisely why you must **never** do this step indoors. If you are allergy-prone, wear a mask.

### 2. Pre-treat according to the fabric

**Objective**: dissolve the fungal pigment and kill the filaments (mycelium) embedded in the fibres.

This is the decisive step. The product and method depend on the textile — see the detailed table in the next section. The general rule:

- **White cotton**: [sodium percarbonate](/en/blog/sodium-percarbonate-laundry/index.md) (the most effective)
- **Colours**: [white vinegar](/en/blog/white-vinegar-laundry/index.md) + baking soda
- **Delicates**: [Marseille soap](https://amzn.to/48721mK)

### 3. Machine wash at 60 °C minimum

**Objective**: kill remaining spores and flush treatment residue.

Moulds die from 60 °C. A wash at [30-40 °C](/en/blog/cold-wash-temperature/index.md) is not enough — it removes dirt but leaves viable spores that will recolonise the fabric as soon as it is damp. For heavily contaminated household linen (sheets, towels), go up to [90 °C](/en/blog/washing-temperatures/index.md) if the care label permits.

Add a glass of [white vinegar](https://amzn.to/4bReOuT) to the softener compartment: it neutralises residual odours and prevents limescale deposits that encourage recontamination.

### 4. Dry completely

**Objective**: eliminate all residual moisture — the number-one factor in recurrence.

The tumble dryer is ideal: it ensures uniform drying right to the core of the fibres. If you air-dry, favour [direct sunlight](/en/blog/indoor-drying-humidity/index.md) — UV has a natural antifungal effect and helps bleach residual marks on whites.

### 5. Inspect and repeat if necessary

Check the stain **after complete drying** (a damp stain always looks lighter than it truly is). If the pigment remains, repeat steps 2 to 4. An old black mould stain may require 2-3 complete cycles.

## Method by fabric type

| Textile | Pre-treatment | Wash temperature | Precautions |
|---|---|---|---|
| White cotton | Sodium percarbonate: 1 tbsp per litre of water at 40 °C, soak 1 h | 60-90 °C | The easiest to treat. Percarbonate releases active oxygen that destroys the pigment and disinfects. |
| Coloured cotton | Pure white vinegar dabbed on the stain, 15 min. Then sprinkle with baking soda. | 60 °C | Test vinegar on a hem first. Avoid percarbonate which may lighten colours. |
| Synthetic (polyester, nylon) | White vinegar soak (1 glass per litre of water, 30 min) | 40-60 °C according to label | Synthetics hold less surface pigment. Vinegar is often sufficient. |
| Silk / wool | Marseille soap rubbed on the damp stain, leave for 30 min | 30 °C max, wool cycle | No percarbonate, no pure vinegar (too acidic). If the stain remains, consult a dry cleaner. |
| Household linen (sheets, towels, tea towels) | Sodium percarbonate: soak 2 h in a basin at 40 °C | 90 °C | Cotton household linen handles the most aggressive treatments. Do not hesitate to go to 90 °C. |
| Outdoor textiles (awning, tarpaulin, garden cushion) | Brush then scrub with diluted black soap. Rinse with a hose. | Hand wash or 40 °C if size permits | Outdoor canvas is thick: insist on initial brushing. Professional laundromat machines (18-27 kg capacity) accept bulky items. |

For white cotton, [sodium percarbonate](/en/blog/sodium-percarbonate-laundry/index.md) is the reference product. When dissolved, it releases hydrogen peroxide and sodium carbonate — a duo that destroys the fungal pigment (bleaching action) while creating an alkaline environment hostile to moulds. Unlike bleach, it is biodegradable and does not weaken fibres.

For colours, [white vinegar](/en/blog/white-vinegar-laundry/index.md) is the best compromise: its acidity (pH approx. 2.5) inhibits fungal growth without risk of discolouration. Baking soda sprinkled on top creates an effervescent reaction that helps dislodge the pigment from the fibres.

## Removing the musty smell

The musty smell is often more stubborn than the stain itself. It comes from **volatile organic compounds (VOCs)** produced by the moulds' metabolism — mainly geosmin and 1-octen-3-ol. These molecules embed in the fibres and resist standard washing.

Three-step treatment:

1. **Baking soda soak** — 2 tablespoons per litre of warm water, for 2 hours. Baking soda neutralises the acidic VOCs responsible for the smell.
2. **60 °C wash + white vinegar** — a glass of white vinegar in the softener compartment. It neutralises odours that the baking soda did not capture and removes limescale residue.
3. **Sun drying** — UV rays degrade residual odour molecules. A few hours of direct exposure often make the difference between a textile that is "almost" and "completely" deodorised.

> At the laundromat, the professional tumble dryer heats to 60-80 °C for 20-30
> minutes. This prolonged heat destroys the last odour molecules and eliminates
> all residual moisture.
> 
> Drying indoors without a dehumidifier
> 
> 
> 
> often leaves enough moisture for the smell to return.

If the smell persists after this complete protocol, the textile is probably deeply contaminated — the mycelium has penetrated to the core of the fibres and continues producing VOCs even after washing.

## When to discard the textile

There comes a point where treatment is no longer worthwhile. Here are the cases where it is better to part with the textile:

- **Persistent odour after 2-3 complete treatments** (brushing + pre-treatment + 60 °C wash + drying). If the mustiness returns every time, the mycelium is too deeply established.
- **Extensive black stains covering more than 20-30% of the surface** — the cost in time and product exceeds the textile's value.
- **Visibly damaged fibres** — mould digests cotton cellulose and wool keratin. If the fabric tears easily where the mould was, the structure is compromised.
- **Textile intended for an infant or immunocompromised person** — in these cases, the benefit of the doubt does not go to the textile. Discard and replace.

> **Warning:**
> - **Do not donate a mouldy textile** — neither as a gift nor for textile recycling. The spores will contaminate other garments on contact.
> - **Bag before discarding** — place the textile in a sealed bin bag to avoid dispersing spores in the bin or waste room.

## Machine washing: 60 °C minimum

After pre-treatment, machine washing is essential. But not just any way.

[Temperature](/en/blog/washing-temperatures/index.md) is the decisive factor. Mould spores resist lukewarm washes: at 30 °C, most survive. At 40 °C, some die but many persist. At **60 °C**, virtually all spores and mycelium are destroyed. At **90 °C**, sterilisation is near complete.

At the laundromat, professional Speed Queen machines offer several advantages for mould treatment:

- **True 60-90 °C temperature** — unlike some domestic machines that do not always reach the displayed temperature, professional machines genuinely heat to the selected temperature.
- **Higher water volume** (50-60 litres) — better rinsing flushes more spores and treatment residue.
- **Powerful spin** (1,000-1,200 rpm) — extracts more residual water, shortening drying time and reducing the window for recontamination.
- **Tumble dryer immediately available** — no laundry sitting damp on the airer for hours.

The direct transfer from washing machine to tumble dryer is the best guarantee against recurrence: the textile never remains in a damp state conducive to recolonisation.

## Prevention

Mould on laundry is almost always a problem of **residual moisture**. The fungus needs three conditions to develop: humidity above 65%, temperature between 15 and 30 °C, and organic matter (the textile fibres themselves). Remove the moisture and mould cannot take hold.

- **Remove laundry immediately after washing** — a damp, closed drum is the perfect incubator. At the laundromat, this habit is natural: you wait for the cycle to finish on site.
- **Never put damp laundry in the dirty laundry basket** — a wet towel contaminates the entire basket in 24 h. Let it dry before putting it in the basket.
- **Dry completely before storing** — the slightest residual moisture is enough. When in doubt, 10 extra minutes in the tumble dryer are worth more than a mould problem to treat.
- **Ventilate the drying room** — if you <a href='/en/blog/indoor-drying-humidity/index.md'>dry indoors</a>, open a window or use a dehumidifier. Ambient humidity should stay below 60%.
- **Clean the seal and drum of your machine** — the rubber seal is a mould reservoir that recontaminates laundry every cycle. <a href='/en/blog/clean-washing-machine-guide/index.md'>Clean it</a> regularly with white vinegar.
- **Store in a dry, ventilated place** — avoid closed cupboards in damp rooms (bathroom, cellar, garage). Leave space between stacks of laundry for air circulation.

Watch out for **seasonal textiles**: winter duvets stored in spring, curtains stored during holidays, ski clothes put away in April. These textiles spend months in a cupboard and are often stored with enough residual moisture to trigger fungal colonisation. Wash and dry completely before any long-term storage.

**White vinegar 14° (5L)**

The ultimate multi-purpose product: natural fabric softener, limescale remover, deodoriser, and colour brightener.

*Cet article contient des liens affiliés. Les prix et la disponibilité peuvent varier.*



## Sources and references

- [Stain removal: solutions for every stain](/en/blog/tough-stain-solutions/index.md)
- [Sodium percarbonate: complete laundry guide](/en/blog/sodium-percarbonate-laundry/index.md)
- [White vinegar and laundry: uses and limits](/en/blog/white-vinegar-laundry/index.md)
- [Wash temperature guide](/en/blog/washing-temperatures/index.md)
- [Drying laundry indoors without humidity](/en/blog/indoor-drying-humidity/index.md)
- [Cleaning your washing machine](/en/blog/clean-washing-machine-guide/index.md)
- [Dust mite allergies: washing as a solution](/en/blog/dust-mite-allergy-laundry/index.md)