Key Takeaways
- Yes, washable curtains can usually be treated successfully at home in the washing machine, but a wash alone is often not enough.
- Pre-treating with a fabric-safe mould spray before washing loosens and kills mould that a standard wash cycle can miss.
- Blackout and lined curtains need extra care, since coatings and backing materials are not always machine washable.
- Fast, thorough drying is the step that actually stops mould coming back, more so than the wash itself.
- Widespread, deeply embedded mould or damaged linings may mean replacement is a better option than treatment.
Mouldy curtains can turn a once fresh, inviting room into a damp, no-go area. If your curtains have developed a musty smell or visible mould spots, you may be hoping a quick trip through the washing machine will sort it out. The good news is that washable curtains can generally be treated successfully at home, provided you use the right preparation and drying technique. Understanding what a washing machine can and cannot do on its own is the key to getting a genuinely clean result rather than a fabric that still smells musty once it dries.
Why a Washing Machine Alone Won't Kill Mould Spores
A washing machine is good at removing dirt, stains and some surface mould, but without a helping hand it can struggle to eliminate every mould spore embedded in the fabric. Mould penetrates deep into textile fibres, especially when exposed to persistent dampness.
A standard wash may improve appearances, but it can leave spores or musty odours behind. That is where pre-treatment comes in. A fabric-safe mould remover like Green Goo's Anti Mould Spray will loosen and kill mould before the curtains go anywhere near the machine.
Pre-Treatment Steps Before Washing
- Take curtains outdoors to avoid releasing mould spores throughout your home.
- Gently shake or brush away loose mould.
- Inspect the fabric for staining and signs of extensive growth.
- Apply a Green Goo mould treatment specifically designed for fabric, testing an obscure section first to check for colour changes.
- Leave the product to work for the recommended dwell time before washing.
- Wash curtains at the warmest temperature the fabric allows, using an appropriate laundry detergent.
- Do not overload the machine. Give the fabric plenty of room to move so water and detergent can reach affected areas effectively.
Special Considerations for Blackout and Lined Curtains
Extra care is needed with blackout and lined curtains. They often contain coatings, backing materials or multiple layers that are not always suitable for ordinary washing.
Some blackout curtains can go in the machine, while others need to be hand washed or professionally dry cleaned. Too much heat can also damage the blackout coating, causing warping or affecting the curtain's appearance. Always check the care instructions before treating mould on this type of fabric.
Drying Techniques That Stop Recurrence
Drying is arguably the most important step after washing mouldy curtains, because mould can return while fabric is still damp:
- Hang curtains immediately after washing. Outdoors is best if permitted; indoors, use fans, open windows or a dehumidifier to speed things up.
- Make sure curtains are completely dry before rehanging them.
- Pay particular attention to hems, seams, linings and thicker sections, which hold moisture longest.
Why Curtains Grow Mould in the First Place
Curtains sit in a uniquely vulnerable spot. They hang close to windows, where condensation regularly forms overnight, and they often stay closed or bunched for long stretches, limiting airflow around the fabric. Heavier curtains and those with linings hold onto that moisture for longer, giving mould exactly the damp, still conditions it needs to establish itself.
Bathrooms, bedrooms with poor ventilation, and any room with single-glazed windows are the most common places for curtain mould to appear. If you notice recurring spots in the same location, it is worth checking the window seal and glazing for condensation before assuming the fabric itself is at fault.
When to Pre-Treat vs When to Replace
Not every set of mouldy curtains is worth saving, and knowing which category yours falls into saves time and money.
| Situation | Pre-Treat | Replace |
|---|---|---|
| Extent of mould | Small, isolated spots | Widespread or deeply embedded |
| Fabric condition | Structurally sound | Weakened, discoloured or damaged |
| Odour | Mild, expected to lift with treatment | Persistent even after cleaning |
| Coatings or linings | Intact | Deteriorating or peeling |
Before deciding whether to treat or replace, it is worth identifying why the mould appeared in the first place. If it is down to persistent condensation, a leaking window or poor ventilation, freshly cleaned curtains can become mouldy again. Understanding how to control moisture in the home is a useful next step once the current problem is dealt with.
Curtains vs Other Fabric in the Home
Curtains are far from the only fabric item vulnerable to mould. Cushions, upholstery, rugs and clothing stored in poorly ventilated rooms face the same risk, for the same reason: moisture trapped against fibres with limited airflow. If mould keeps appearing on soft furnishings around the home rather than just your curtains, it is worth treating each affected item with a fabric-safe mould remover and looking at ventilation in the room as a whole, rather than tackling each item in isolation.
Keeping Curtains Mould-Free Between Washes
Once curtains are clean and dry, a few small habits go a long way toward keeping them that way:
- Open curtains during the day to let air and light reach the fabric, rather than leaving them drawn constantly.
- Wipe down window sills and glass regularly, especially in the cooler months when condensation is most common.
- Leave a small gap between curtains and the window where possible, so damp air is not trapped directly against the fabric.
- Run an extractor fan or open a window after showering if curtains are near a bathroom or ensuite.
- Give curtains an occasional inspection along the hem and lining, where mould tends to establish first and is easiest to miss.
These habits will not replace the need for an occasional deep clean, but they do reduce how often mould appears in the first place, which means less frequent pre-treatment and washing overall.
Frequently Asked Questions
Can I put mouldy curtains straight into the washing machine?
You will get a better outcome if you pre-treat visible mould first. Washing removes mould and spores to an extent, but a fabric-safe pre-treatment deals with established growth and stubborn odours more thoroughly.
Should I use bleach on mouldy curtains?
Unless the curtain manufacturer specifically says it is suitable, no. Bleach can cause colour loss and damage fibres and specialised coatings. A fabric-safe mould treatment is a much better option.
Why do my curtains keep getting mouldy after I wash them?
This usually points to an ongoing moisture source, such as condensation on the window behind the curtain, rather than a washing problem. Improving ventilation and drying curtains fully and promptly after every wash will help break the cycle.
How do I know if my curtains are machine washable?
Check the care label sewn into the curtain, usually along a side seam or bottom hem. If there is no label or you are unsure, treat the curtains as delicate and consider hand washing or professional cleaning, particularly for blackout or lined styles where a coating could be damaged.
