How to Wash Blockout Curtains (Hand, Machine and Spot Clean)
Quick answer: check the care label first. If it allows washing, hand wash in cold water with a mild liquid detergent, or use a cold gentle cycle in a front loader with a wash bag and no spin. Never tumble dry. Hang them to drip dry in the shade.
Blockout curtains (also called blackout curtains) have a coated backing that does the work of blocking light and holding heat. Wash them the wrong way and that coating can crack or peel, and once it goes it cannot be fixed.
We make and install curtains across Sydney, and coating damage from washing is one of the most common problems we see. This guide covers hand washing, machine washing, spot cleaning, drying and when to leave it to a professional.
What Makes Blockout Curtains Different?
Blockout curtains aren’t like ordinary fabric curtains. They’re designed with an acrylic or foam backing that gives them their signature benefits like effective light control, UV protection, noise reduction, and improved thermal insulation. This backing is what makes your room darker, cooler, and more private, and it’s the main reason blockout curtains perform so well in homes across Sydney.
However, this same coating is far more delicate than most people realise. Heat, harsh detergents, friction, scrubbing, and even the movement inside a washing machine can weaken, stretch, or peel the backing. That’s why traditional washing methods that work for normal curtains can be disastrous for blockout fabrics, often resulting in damage that can’t be reversed.
Why You Should Be Careful When Washing Blockout Curtains
Before we look at how to wash them, you need to understand why gentle care is essential.
- The coating can crack under heat: Even warm water can cause the blockout layer to bubble or peel.
- Detergents can dissolve the surface: Chemicals not designed for coated fabrics can strip the foam backing.
- Scrubbing damages the light-blocking film: Friction thins the coating and once it's damaged, it can’t be repaired.
- Machine cycles stretch or wrinkle the coating: Even “delicate” modes can cause movement that leads to cracking.
In short: treating blockout curtains like normal curtains is the fastest way to ruin them.
How to Wash Blockout Curtains Without Damaging the Coating
Here’s the correct, safe method, broken down clearly so you can follow it step-by-step.
Step 1: Check the Label (Don’t Skip This!)
Not all blockout curtains are made the same, which is why the care label is the most important place to start. It tells you whether handwashing is allowed, if the fabric is strictly spot-clean only, whether it can be dry-cleaned, and what types of detergents are safe to use. If the label says “Dry Clean Only,” it’s essential to follow that instruction, washing them anyway will almost certainly damage the delicate coating.
Step 2: Remove Dust Before Washing
Think of this as a pre-wash stage, because dust is abrasive and removing it first helps protect the coating. You can gently vacuum the curtains with a soft-brush attachment, use a light lint brush, or shake them outdoors to release loose dust, but avoid beating, smacking, or brushing aggressively, as this can damage the backing.
Step 3: Hand Wash (The Safest Option)
If your blockout curtains are suitable for home washing, handwashing is always the safest method because it minimises friction and protects the delicate coating. Start by preparing a clean bathtub or large laundry trough filled with cold water, and use only a mild, liquid detergent with a neutral pH, never bleach or brightening agents.
When washing, gently submerge the curtains and move them lightly through the water, keeping the coated side facing up so it doesn’t scrape against the surface. The goal is to loosen dirt without rubbing or applying pressure. Be careful to avoid rubbing, scrubbing, wringing, or twisting the fabric at any stage, as these actions can cause the coating to crack, stretch, or peel, damage that cannot be reversed.
Step 4: Rinse Gently
- Drain the soapy water, fill with cold water, and lightly agitate.
- Rinse until there are no suds left, but never wring the fabric.
Step 5: Dry Them the Right Way
This step matters a lot, because drying is where most accidental damage occurs. You should never machine dry blockout curtains or expose them to direct sunlight, heaters, or blow dryers, as heat can distort or weaken the coating.
Instead, hang the curtains on a clothesline by the fabric (not the coated side), place them in a shaded, well-ventilated area, and allow them to drip-dry naturally. Even a single session of direct sunlight can harden or crack the blockout coating, so shade drying is essential.
Can You Machine Wash Blockout Curtains?
Some blockout curtains can go in the machine, but only if the care label says so. If yours do:
- Take out all hooks, rings and weights first.
- Put the curtain in a large mesh wash bag, or wash it on its own.
- Use a front loader if you can. Top loaders with an agitator are rough on coatings.
- Choose a cold, gentle or delicate cycle with a low spin or no spin.
- Use a small amount of mild liquid detergent. No bleach, no fabric softener.
- Take it out straight away and hang it to drip dry in the shade.
If the curtain is large or heavy, or the label says hand wash or dry clean, do not put it in the machine.
Coated Blockout vs Triple Weave Blockout
Not all blockout curtains have a coating. Triple weave blockout uses a tightly woven black thread in the middle of the fabric instead of a coated back. Triple weave is usually more forgiving to wash, while coated (acrylic or foam backed) fabrics need the most care. Your care label will tell you which you have.
Hand Wash vs Machine vs Spot Clean vs Dry Clean
| Method | Best for | Risk to coating |
|---|---|---|
| Spot clean | Small marks, regular upkeep | Lowest |
| Hand wash | Most coated blockout curtains (if the label allows) | Low |
| Machine wash | Curtains labelled machine washable, triple weave | Medium |
| Dry clean | Curtains labelled dry clean only | Depends on the cleaner. Ask if they handle coated fabrics |
How to Spot Clean Blockout Curtains
Sometimes you don’t need to wash the entire curtain, especially if only a small mark is present. Spot-cleaning is safe to do only if your care label confirms it, as some coatings are too delicate for any form of targeted cleaning.
To spot-clean properly, use a soft cloth, cold water, and a small drop of mild detergent, then gently dab the area without rubbing. If the stain doesn’t lift easily, avoid scrubbing or applying pressure by forcing it to thin or damage the coating.
How to Get Rid of Smells and Mould Spots
- For musty smells, air the curtains outside in the shade on a dry, breezy day.
- A light mist of a water and white vinegar mix on the fabric side can help. Test a small hidden spot first.
- If there is mould on the coated back, the coating may already be damaged. Spot clean gently, and if it keeps coming back, it is usually time for new curtains and a check for moisture around the window.
When to NOT Wash Blockout Curtains
Some situations call for professional cleaning. Avoid DIY washing if:
- The coating is already peeling
- There is mould growing on the backing
- The curtains are old and the coating feels stiff or brittle
- The label says “Dry Clean Only”
- The curtains are textured or embossed
- The fabric is heavy or large (risk of stretching)
When in doubt, professional cleaning is safer and far cheaper than replacing curtains, especially for homes with curtains in Paddington or surrounding areas.
Common Mistakes Sydney Homeowners Make
Sydney’s climate adds unique challenges. Here are the mistakes we see most:
- Washing during humid weather: moisture slows drying, which can lead to mould.
- Drying curtains in the sun: Sydney sunlight is strong, and harsh UV damages the coating.
- Washing too often: most blockout curtains do not need a full wash often. Regular vacuuming and spot cleaning will keep them fresh for a long time.
- Using detergents without checking the ingredients: stick to a mild liquid detergent and avoid bleach, brighteners and fabric softener.
How to Maintain Blockout Curtains So They Last Longer
If you want to avoid washing often, simple maintenance goes a long way.
Do this monthly:
- Vacuum the front and back
- Shake out dust
- Check for early signs of mould
- Ensure windows aren’t leaking moisture behind the curtains
Do this annually:
- Air the curtains outdoors (shade only)
- Inspect for peeling
- Spot-clean small marks
Small habits extend your curtain’s lifespan significantly, whether you have curtains in Surry Hills or other surrounding areas.
When to Call a Professional Curtain Cleaner
A professional cleaner is the safest option when:
- Your curtains are expensive
- You’re unsure about the fabric
- You’ve never cleaned blockout curtains before
- The curtains cover large sliding doors
- The coating is beginning to show age
Professional curtain cleaners have methods suited to coated fabrics, and many will clean curtains on site.
Blockout Curtain Cleaning FAQs
Can blockout curtains be dry cleaned?
Only if the care label says so. Some dry cleaning solvents can harm coated backings, so ask the cleaner whether they handle coated blockout fabric before you drop them off.
Can I clean blockout curtains while they are hanging?
Yes, for regular upkeep. Vacuum both sides with a soft brush attachment and spot clean marks with a damp cloth and mild detergent. A full wash needs them taken down.
How do I clean curtains I can't take down?
Vacuum them in place, spot clean marks, and use a handheld steamer on the fabric side only if the label allows steaming. For large or hard to reach curtains, a professional on-site clean is the safer choice.
Can you tumble dry blockout curtains?
No. Heat is one of the main causes of cracked and peeling coatings. Always drip dry in the shade.
Do blockout and blackout curtains need different care?
No. They are two names for the same thing. What matters is whether the curtain is coated or triple weave.
Coating Already Worn Out?
Treat the coating with care, and your curtains, whether you live in Mosman or nearby areas, will last for years. But if your blockout curtains are already cracking, peeling or letting light through, washing will not bring them back.
Roma Blinds makes and installs made-to-measure blockout curtains across Sydney, and you can pair them with sheer curtains for daytime privacy. Thinking about both? See our guide to layering sheer and blockout curtains.
