How to wash a duvet (and when not to)

01Why duvets need washing

A duvet cover is washed every week or two, so it is easy to forget that the duvet inside needs cleaning too. Every night, a body releases warmth, moisture and skin cells. Most of that is caught by the cover, but some passes through to the duvet itself. Over months, the filling collects sweat, body oils, dust and the dust mites that feed on skin flakes. A duvet that has never been washed may look fine, but it can smell slightly stale, feel flatter and trigger allergies in some people.

Washing a duvet once or twice a year, or more often if anyone in the household has allergies, keeps it fresh, restores some of its loft and reduces allergens. The challenge is that duvets are bulky, heavy when wet and very slow to dry. Done well, a wash leaves a duvet fluffy and fresh. Done badly, it leaves the filling lumpy, the seams strained and the centre damp, which leads to musty smells and even mildew.

This guide explains how to check whether your duvet can be washed, whether it will fit your machine, how to wash and dry it properly, and when it makes more sense to use a launderette or a laundry service.

02Step one: check the label

The care label tells you whether the duvet can be washed, at what temperature and whether it can be tumble dried.

03Step two: check the duvet

Before washing, look over the duvet carefully.

• Check seams and stitching for splits; washing can turn a small split into a burst seam and filling everywhere.
• Check the fabric for thin areas or holes.
• Look for stains and note them.
• If the duvet is old, flat and lumpy already, washing may not restore it.

Repair small splits before washing, or have the duvet cleaned professionally.

04Step three: will it fit?

The most common mistake is washing a duvet in a machine that is too small. A duvet needs room to move, so water and detergent can pass through the filling and rinse out again.

05Protecting your washing machine

A wet duvet is surprisingly heavy, and a machine that is too small or overloaded can be damaged.

When a duvet absorbs water, it can weigh many times its dry weight. During the spin cycle, all that weight is thrown against the drum, and if it is bunched on one side, the drum becomes unbalanced, causing the machine to shake, walk across the floor or stop the cycle. Repeated heavy, unbalanced loads strain the drum bearings and suspension.

To protect your machine, only wash duvets that fit comfortably with room to move, use the duvet or bulky cycle if available, consider a lower spin speed for very heavy duvets and stay nearby during the spin in case the machine becomes unbalanced. If your machine struggles, use a launderette or laundry for the duvet next time.

06Different fillings, different washing

The filling decides how a duvet should be washed and dried.

07Step four: washing

08Step five: drying (the hard part)

Drying is where most duvet washes go wrong. The outer fabric dries quickly, but the filling holds water deep inside. A duvet that feels dry on the surface can still be damp in the middle, and a damp duvet put back on the bed will smell musty within days and may grow mildew.

09A simple dryness test

Before putting a washed duvet back on the bed, do a three-point check. First, press your palm flat into the centre for a few seconds; it should feel warm or neutral, never cool. Second, squeeze each corner, where filling tends to gather and dry last. Third, bring a fold of the duvet to your nose; it should smell of nothing, not of damp. If any test fails, give it more time in the dryer or the fresh air.

10Fixing clumps and flat spots

Even with care, filling can clump after washing.

For synthetic duvets, a longer tumble on low heat with dryer balls, with frequent shaking, usually breaks up clumps. For feather and down, clumps often mean the filling is still damp; keep drying and shaking until the clumps open up. Hand-teasing clumps apart through the fabric helps too.

If a duvet stays lumpy after it is completely dry, the filling may have broken down with age. Older synthetic fillings in particular can lose their bounce permanently, and the duvet may be due for replacement.

11When a duvet smells

A duvet that smells musty after washing almost always has damp filling somewhere. Put it back in the dryer, or hang it out on a dry, breezy day, until it is completely dry. If the smell remains once it is fully dry, the duvet may have been stored damp for too long or have mildew inside, and a professional clean or replacement may be needed.

A duvet that smells of detergent was not rinsed enough. Run an extra rinse cycle with no detergent and dry it again.

A feather duvet may smell faintly of feathers when damp; this usually disappears once it is fully dry.

12Airing a duvet

Airing is one of the simplest ways to keep a duvet fresh between washes. On a dry, breezy day, hang the duvet over a line or a balcony rail, or drape it over two chairs by an open window. A few hours of fresh air lets moisture and stale smells escape and helps the filling recover its loft. Avoid strong direct sunlight for long periods, which can weaken some fabrics and fillings over time. In a flat with no outdoor space, opening the bedroom window and folding the duvet back each morning so the bed can breathe helps a lot.

13Protectors and covers

A good duvet protector, a zipped or envelope cover that goes on before the decorative duvet cover, is the best way to reduce how often the duvet itself needs washing. It catches sweat, skin and spills and is easy to wash with the sheets. Allergy-friendly protectors with a tight weave also help keep dust mites out of the filling.

Duvet covers should be washed every week or two with the sheets. A clean cover protects the duvet; a dirty one passes sweat and oils through.

14How often to wash a duvet

Airing a duvet every few weeks between washes keeps it fresh and reduces how often it needs washing.

15Duvets and allergies

Dust mites live in bedding, feeding on skin flakes, and their droppings are a common allergy trigger. Washing duvets regularly, at the highest temperature the label allows, helps reduce them. Many people with allergies choose synthetic duvets that can be washed hot, and use allergy-friendly protectors on duvets and pillows. Airing duvets regularly and keeping bedrooms well ventilated also helps.

16After illness, spills and accidents

Sometimes a duvet needs washing urgently: a child has been sick, there has been a bedwetting accident or a cup of tea has soaked through.

• Remove the cover and wash it separately.
• Blot as much liquid as possible from the duvet.
• If the duvet is washable, wash it promptly rather than leaving it to dry with the stain inside.
• For urine and vomit, rinse the area with cool water first if you can.
• Dry it thoroughly before putting it back.
• If the duvet cannot be washed at home, take it to a laundry or professional cleaner quickly and tell them what happened.

17Stains on duvets

Most duvet stains come through the cover: tea, coffee, make-up, sweat, blood from a nosebleed and the occasional pet accident. Because the filling sits right behind the outer fabric, liquids soak in quickly and are hard to reach.

Act fast. Remove the cover and blot the duvet with a clean cloth to draw out as much liquid as possible. For protein stains like blood, dab with cool water, never hot. Avoid soaking the whole area, which pushes the stain deeper into the filling. If the duvet is washable, wash it soon rather than letting the stain set. If it is not, take it to a professional and tell them what the stain is.

Old yellow patches on duvets usually come from sweat built up over years. A wash can improve them, but very old marks may not fully disappear.

18Children's duvets and cot quilts

Children's duvets and cot quilts need washing more often than adults' duvets, because of spills, accidents and illness. They are smaller, so they usually fit a home machine and dry more quickly.

• Choose machine-washable children's duvets that can be washed warm and tumble dried.
• Keep at least two, so one can be in the wash.
• Use a waterproof protector.
• Wash after any accident or illness.
• Check the label on cot quilts and follow safe sleep advice for babies, which often recommends against loose bedding for very young infants.

19While you are at it: pillows

Pillows collect even more sweat and skin oils than duvets, because they are right under the head. Many pillows can be washed in the same way as duvets: check the label, wash two at a time to balance the machine, use a mild detergent and an extra rinse, and dry thoroughly on low heat with dryer balls. Feather pillows, like feather duvets, need long, thorough drying. Memory foam and latex pillows should not usually be machine washed; follow the maker's advice.

20Using a launderette

Launderettes are a practical option for duvets that are too big for a home machine.

• Choose a large-capacity washer suitable for your duvet's size.
• Bring your own mild detergent or down detergent.
• Use a large dryer on a low or medium setting.
• Bring dryer balls or tennis balls.
• Allow plenty of time; drying a duvet properly can take a long time.
• Check the duvet is completely dry before taking it home.

21Washing duvets in a London flat

Duvets are the hardest item to wash in a small flat. The machine is often too small, there may be no tumble dryer, outdoor space is limited and an air-drying duvet fills a room and adds a great deal of moisture to the air.

If you have no dryer, the most realistic options are a launderette with large dryers, a laundry service, or air drying outside on a balcony or in a shared garden on a dry, breezy day. Drying a duvet indoors in winter is slow and risks both a musty duvet and condensation in the flat. If you must, use a dehumidifier in the room, drape the duvet over two airers so air reaches both sides, turn and shake it several times a day and allow two or three days.

Many flat dwellers find it easiest to wash covers and sheets at home and send duvets and pillows out once or twice a year.

22Tog, seasons and washing

Duvets in the UK are rated by tog, a measure of warmth. Lower tog duvets, often used in summer, are thinner and easier to wash and dry. Higher tog winter duvets are thicker and hold more water, so they take longer to dry. All-season duvets, made of two layers that clip together, are particularly practical for washing: each layer can be washed and dried separately, which makes them fit smaller machines and dry far more quickly.

When switching between seasonal duvets, it is a good moment to wash the one coming off the bed before storing it, so it is clean and fresh when it is next needed.

23Storing a spare or seasonal duvet

Many people switch between a lighter summer duvet and a warmer winter one, or keep a spare for guests.

• Wash or air the duvet before storing it, and make sure it is completely dry.
• Store it in a breathable cotton bag, not a sealed plastic bag.
• Keep it somewhere cool and dry, such as a wardrobe shelf or under a bed.
• Vacuum storage bags save space but compress the filling; feather and down may take time to recover. If you use them, unpack the duvet a day or two before it is needed and shake it well.
• Air the duvet for a few hours before using it again.

24When to replace a duvet

Duvets do not last forever. Consider replacing one when:

• The filling stays flat or lumpy even after washing and drying properly.
• There are cold spots where the filling has thinned.
• Seams have split repeatedly.
• It smells even after a thorough wash and dry.
• Allergy symptoms seem worse at night despite clean bedding.

Good-quality feather and down duvets often last longer than cheaper synthetic ones when cared for well.