How to clean curtains without ruining them.

The wrong cleaning method can damage a curtain that only needed routine care. Consider these examples: A lined curtain that went through a warm machine cycle and came back with the lining hanging 30mm below the face. A sheer that was tumble dried and now has permanent creases. A blockout with a coated back that cracked into a map of fine lines after it was wrung out. Each of these was clean when it came out of the wash, and each was finished as a curtain.

The good news is that the decision is not complicated once you know what you are looking at. Four things decide it: what the fabric is, whether there is a lining and how it is attached, what the care label says, and what the problem actually is. Dust needs a different answer from a mould spot or cigarette smoke. This guide walks through each one, then gives you a tool that turns your answers into a written care plan you can keep with the curtains.

Start with the make, not the stain

Before you look at the label, turn the curtain over and look at the back. You are trying to identify one of five constructions, because each one reacts to water, heat and agitation differently.

Unlined. A single layer of fabric with a hem and a heading tape. Most sheers are made this way, and so are some casual linen-look curtains. With only one layer there is nothing to shrink against, which is why these are the best candidates for a home wash.

Detachable lining. The lining is a separate curtain hooked onto the same heading tape or onto its own track. You can unhook it and clean the face and the lining separately, each by its own method. This is the most forgiving lined construction.

Sewn-in lining. The lining is stitched to the face along the sides and the heading, and hangs loose or is tacked at the hem. The two fabrics are almost always different fibres. If one shrinks more than the other in the wash, the curtain pulls, puckers down the side seams or ends up with the lining showing below the hem.

Interlined. A soft padding layer sits between the face and the lining. These curtains hang beautifully and hold heat well, and they are the ones that should never see a home machine. Wet interlining is heavy, dries slowly and can bunch.

Coated blockout or triple weave. Some blockout fabrics get their light blocking from a foam or acrylic coating on the back, which feels slightly rubbery. Triple weave gets it from a dense woven black thread in the middle and feels like ordinary heavy cloth on both sides. Coatings are the more fragile of the two: heat, wringing and folding while wet can crack them, and once cracked, light shows through as fine lines.

Reading the care label

Care labelling for textiles, including furnishings, is covered by the ACCC's Consumer Goods (Care Labelling) Information Standard 2023, which lets labels use either the Australian and New Zealand wording and symbols or the international ISO symbol set. Window blinds are one of the listed exemptions, which is why a roller blind rarely has instructions but a curtain or its fabric usually does. On made-to-measure curtains the label is often sewn into a side hem near the bottom or into the heading on the lining side. If the curtains came with the house, check both corners at the bottom before assuming there is nothing.

The symbols you need are few. A tub means wet washing is allowed, and the number or dots inside it set the maximum temperature. A hand in the tub means hand wash only. A crossed-out tub means do not wet wash. A circle means professional dry cleaning, and a crossed-out circle means do not dry clean. A square with a circle inside is tumble drying, and for curtains you will almost always want to treat that as crossed out whatever the label says, because tumbling sets creases in long panels.

If there is no label, ask the original supplier or a professional curtain cleaner to identify a suitable method before wet washing, steaming or dry cleaning. A hidden-spot test can reveal colour transfer or water marks, but it cannot prove that a whole panel will keep its size, coating or shape. Give the cleaner photographs of both sides, the heading and any lining attachment, and explain whether the concern is dust, a stain or suspected mould.

Method by curtain type

Once you know the construction and the label, the method mostly picks itself. The table below is the short version. It assumes the label allows the method listed; where the label is more restrictive, the label wins.

Size is the practical limit that catches people out. A pair of floor-length curtains for a stacker door can be several metres of fabric per panel, and a front loader that is too full cannot move the water through the cloth, so it leaves soap in the folds and presses creases in. If a single panel fills more than about half the drum when loosely gathered, a bath with cold water and a gentle swish, or a laundromat's large machine on a cold delicate setting, does a better job than forcing it into the home machine.

Taking curtains down and getting them back up straight

The cleaning is often the easy part. Getting a curtain off the track without losing hooks, and back on so that the folds sit evenly, is where an afternoon disappears. Photograph the curtain on the track from the front and from the side before you touch it. The side photo shows how deep the folds sit and which way the leading edge turns, which you will want when you dress it again.

S-fold and wave curtains hang from snap tape that clips onto carriers linked at fixed spacing. Unclip from the end nearest the wall and work toward the centre, and do not pull the carriers out of the track. The spacing cord or chain between carriers is what makes the waves even, and if a carrier comes out of an end cap it has to be threaded back in the right order. Before rehanging, count the snaps on the tape and the carriers on the track so you know they still match.

Pinch pleat and pencil pleat curtains hang on hooks. Take the hooks out before cleaning and put them in a labelled bag per curtain, because metal pin hooks rust in the wash and plastic hooks snag the fabric. When you rehook, the hook position in the tape sets the height of the curtain. Put them back in the same pocket of the tape they came from, or the curtain will sit higher or lower than it did and the hem will no longer clear the floor the way it used to.

Eyelet curtains slide off the end of the rod once the finial is removed. They are the simplest to take down, but the rings can mark or rust if they are plated metal, so check them before a wet wash and wrap them in a thin towel held with a rubber band if the label allows washing.

If the care instructions permit damp rehanging, rehang washable curtains while slightly damp and confirm the track can carry their weight. The weight of the fabric pulls out most of the light creasing as it dries, and the curtain settles to its working length on the track instead of on a clothes line. Then dress it: draw the curtain fully open, run your hand down each fold from the heading to the hem so the folds line up, and tie it loosely with soft strips of fabric at two or three heights for a day. That trains the folds back into shape.

Shrinkage, and how to keep the length you paid for

A made-to-measure curtain was cut to finish a set distance off the floor. Even a small change in drop is visible, because the eye reads the gap at the hem against the skirting and the floor. Natural fibres such as cotton and linen are the most likely to shrink with warm water and a long spin, and many blends shrink a little too. Polyester is far more stable, which is part of why most sheers are polyester.

Measure before you clean. Take the drop at both side hems and in the middle of each panel, from the top of the heading to the bottom of the hem, and write it down. Follow the care label for water temperature, agitation, drying and rehanging. Where a cold gentle wash and damp rehanging are permitted, those instructions can help limit avoidable handling damage. If the curtain comes back shorter, measure again once it has hung for a couple of days, because some of the loss recovers as the weight pulls the weave back out.

If the length does not recover, there are options before replacement. A curtain with a deep hem can often be let down. A lining that has shrunk shorter than the face can be released at the hem and rehemmed. Our curtain alterations guide covers what can be fixed and when it is not worth it.

Care between cleans

The cheapest clean is the one you delay. Dust settles on the top of the folds and in the heading, and over time it works into the weave where it looks grey and needs a wet clean to shift. A monthly or two-monthly pass with the soft brush attachment on the vacuum, at low suction, working from the heading down, keeps most curtains looking fresh for years. Hold the hem in your other hand so the vacuum does not draw fabric into the nozzle.

Leading edges, the vertical edges where hands pull the curtain open and closed, pick up skin oils and go grey long before the rest. If your curtains are on a track, a wand fitted to the leading carrier removes most of that handling. A hand-held garment steamer on a low setting, held a hand width off the fabric, freshens creases and light odours on many polyester fabrics while they hang, but test it on a hidden spot first and never use steam on a coated blockout or on velvet pile.

Airing matters more than people think. On a dry day with a light breeze, opening the window behind the curtain for an hour does more for a stale smell than any spray, and fabric fresheners can leave rings on some fabrics.

Mould spots and condensation

Black or grey spotting along the bottom of a curtain may be mould, particularly where the lining regularly touches damp glass. Appearance alone does not establish the cause. In a cold Cardinia winter, water forms on single glazing overnight, runs down the glass, pools on the sill or in the track and wicks into the hem that is resting against it. Curtains that are closed against wet glass for weeks at a time are the ones that go.

The Better Health Channel's advice is that soft fabric articles affected by mould should be washed in a machine on a hot cycle, and that soft furnishings which cannot go in a machine need professional cleaning or, if that is not possible, may need to be thrown out. For curtains, the care label decides which of those is available to you. A hot cycle that suits a bath towel will shrink many curtain fabrics, so a mouldy lined or linen curtain usually goes straight to the professional option. Do not apply a bleach spray without compatible fabric-care instructions; it can discolour or damage the curtain.

Cleaning without fixing the moisture only buys a season. The same advice notes the only real control is the moisture source. Wipe the glass and sill in the morning, open the curtain during the day so the gap behind it can dry, run exhaust fans in wet rooms, and check the hem clears the sill or floor. If a room keeps producing condensation, our thermal curtains and pelmets guide explains how a better sealed curtain changes where the cold air sits.

When cleaning is not worth it

Before paying for a professional clean on an old set, check whether the fabric will survive it. Sun-rotted fabric is the common problem in north and west facing rooms. Look closely at the leading edge near the top, where sunlight may have weakened the fabric. Avoid pulling on a fragile panel to test it. If the fabric feels papery or starts to tear, a clean will likely finish it off. Lining that has already gone brittle or started splitting along the folds is another sign. So is a coating that already shows cracks when you hold the curtain up to the light.

In those cases, the better spend is a new lining on a good face fabric, or new curtains. The fabric guide compares how different fabrics handle sun and washing, and the pricing page gives the current bands for a new make so you can compare like with like.

Common mistakes and how to fix them

Curtain cleaning questions

Sources: ACCC Product Safety, Care labelling for clothing and textiles mandatory standard; Better Health Channel, Mould and your health.