How to Wash Cashmere by Hand: The Method We Use, Step by Step

Somebody brings a jumper into the factory perhaps twice a month. Usually with the same expression, and usually holding something that used to fit them.

Almost always it went into a machine on the wrong programme, or it came out of a basin that was hotter than it should have been. Once the damage is done there is very little anyone can do, which is a slightly bleak thing to say at the start of an article, though it does explain why we take this subject seriously.

The good news is that the process itself is undemanding. Fifteen minutes at the sink, a bowl, and something mild to clean with. No specialist equipment, no expensive service, no anxiety. Get the temperature and the handling right and a well-made piece will come out looking better than it went in.

What follows is the method we actually recommend to customers, along with the reasoning behind each step, because knowing why something matters makes it far easier to remember.

Why Hand Washing Beats the Alternatives

Three options exist. Only one of them is reliably safe.

• Dry cleaning uses solvents that strip the natural oils from the fibre over repeated visits. Occasional use is fine, particularly for structured garments or stubborn stains, but as a routine it gradually dulls the handle. Cashmere emerges clean and slightly lifeless.

• Machine washing can work on a genuine wool cycle at low temperature with no spin, and modern machines are far better at this than they were a decade ago. The risk sits in the spin phase and in the agitation, both of which do exactly what you don't want.

• Hand washing gives you complete control over temperature and movement, which are the two variables that decide whether a garment survives.

I'd add a small caveat here. Plenty of people machine wash cashmere successfully for years and think the whole hand method is fussy nonsense. They may be partly right. But the failure mode is permanent, and the time saved is about ten minutes, so the maths seems clear enough to me.

How often should you actually clean cashmere?

Less often than most people assume. The fibre resists odour naturally and holds moisture without feeling damp, which means airing does most of the work that a wash would.

• Jumpers worn against a shirt: every eight to ten wears

• Jumpers worn against skin: every four wears, roughly

• Scarves and beanies: once or twice a season

• Anything with a visible mark: spot clean first, full wash only if that fails

Two or three cleans across an autumn and winter is plenty for most garments. Every wash costs the fibre a little, so restraint is genuinely part of good cashmere care.

What You Need Before You Start

The list is short.

1. A clean basin, bowl or sink, large enough for the garment to lie open rather than crumpled

2. A mild, pH-neutral detergent formulated for delicates

3. Two clean, dry towels

4. A flat drying surface, ideally a mesh rack or a spare towel on a table

5. A thermometer, if you have one, though a hand test works

That's it. No mesh bags, no fabric conditioner, no specialist gadgets.

The detergent question

This matters more than people expect, and it's the step most often got wrong.

Biological detergents contain protease enzymes designed to break down protein. Cashmere is protein, being built from keratin, the same material as human hair. Using a bio detergent on it is roughly like washing your jumper in something engineered to digest it.

So: no bio formulas, no bleach, no optical brighteners, no fabric softener. Softener coats the fibres and flattens the loft that gives cashmere its warmth.

What does work:

• A dedicated delicate wash or cashmere shampoo

• Plain baby shampoo, which is mild and pH-appropriate

• A pH-neutral liquid marked for delicates

Use less than you think. Roughly a teaspoon for a single piece. Excess is difficult to rinse out and leaves residue that attracts dirt faster.

Five Checks Before the Water Goes In

Skipping these is how small problems become expensive ones.

• Read the label: A basin symbol with a hand means hand wash only. A basin with a number gives the maximum temperature. A crossed-out basin means the manufacturer really does want it professionally cleaned, and while that's sometimes over-cautious, it's their garment specification rather than a suggestion.

• Check the composition: A cashmere and silk blend behaves differently from pure cashmere. Silk dislikes alkaline detergents in particular.

• Test the colour: Dampen a cotton bud, press it against an inside seam, and see whether any dye lifts. Deep reds and indigos are the usual offenders. Wash those separately, always.

• Look for existing damage: Small holes get considerably larger when wet fabric takes on weight. Mend first.

• Turn it inside out: This protects the outer surface from the small amount of friction that hand washing still involves, and it reduces pilling on the face of the fabric.

The Method, Step by Step

Here is the sequence. It takes about fifteen minutes of actual attention.

1. Fill the basin with lukewarm water: Woolmark recommends approximately 30°C for washing protein fibres. If you don't have a thermometer, it should feel neutral against the inside of your wrist. Not warm, not chilly. Fill enough for the garment to move freely.

2. Add the detergent and mix it through properly: Swirl the water until the liquid is fully dispersed. Never pour detergent directly onto the fabric, since concentrated liquid on one spot can lift colour.

3. Submerge the garment and press it gently under: Open it out flat rather than balling it up. Press down with your palms two or three times to help the water penetrate.

4. Let it soak for ten minutes: No stirring, no scrubbing, no wringing. Time does the cleaning here, not effort. This is the part people find hardest, oddly enough, because doing nothing feels like doing nothing.

5. Squeeze the fabric gently, without twisting: Support the weight of the piece with both hands. Wet cashmere can hold a surprising amount of water, and letting it hang from one sleeve will stretch it out of shape in seconds.

6. Rinse in water at the same temperature: Do not go straight to cold. Sudden temperature change causes the fibre's cuticle scales to react sharply, which encourages felting. Woolmark suggests rinsing first in lukewarm water, then finishing with cool water once the detergent is out.

7. Repeat the rinse until the water runs clear: Usually two rounds is enough. Residual detergent stiffens the handle and dulls the colour.

8. Press the water out against the side of the basin: Cup the garment in your hands and squeeze downward. Twisting is what breaks the fibres.

Water temperature, and why it matters above everything else

Worth pausing on this, because it explains almost every ruined jumper we've been shown.

Cashmere fibres carry microscopic overlapping scales along their surface, similar in structure to a strand of human hair. Heat causes those scales to lift. Agitation then pushes the raised scales of one fibre into its neighbours, where they lock together like hooks. The International Wool Textile Organisation describes this as irreversible entanglement, and irreversible is the operative word. No treatment recovers it.

Three conditions have to be present at once for felting to occur: heat, moisture and mechanical action. Remove any one and the risk drops sharply. In a basin you cannot remove moisture, obviously, so you control the other two.

Keep the temperature at or below 30°C and keep your hands slow. That's really the whole technique.

Drying Without Stretching It Out of Shape

Drying causes more distortion than washing does, though it gets a fraction of the attention.

• Roll, don't hang: Lay the piece flat on a dry towel, roll the towel up with the garment inside, and press along its length. The towel takes most of the remaining water. Unroll, then move to a second dry towel if the first is saturated.

• Reshape while damp: Pat the garment back to its original dimensions. Square the shoulders, straighten the cuffs, match the side seams. Cashmere accepts a new shape while wet and keeps it once dry, which works in your favour if you're paying attention and against you if you're not.

• Dry flat, away from heat: No radiators, no direct sun, no airing cupboard. A mesh rack allows air to circulate underneath and speeds things up. Turn the piece over halfway through.

• Never hang a wet garment: Damp fabric hanging from a hanger stretches under its own weight, and the result is a jumper that's wide at the hem, tight at the chest, and permanently odd looking.

Expect somewhere between twelve and twenty-four hours depending on the weight of the piece and the humidity of the room. Chunky pieces take longer. Fine gauge scarves can be ready by the evening.

Stains, Odours and Spot Cleaning

Full immersion isn't always the right answer. Sometimes it's overkill.

Blotting rather than rubbing is the general principle. Rubbing pushes the mark deeper and creates exactly the friction that damages the surface.

One thing I'd mention because it comes up often: never apply neat detergent to a stain on cashmere. Dilute it first. Concentrated liquid on a small area lifts dye and leaves a pale patch that's worse than the original mark.

Mistakes That Ruin Cashmere

A short list, drawn from garments people have brought us.

• Hot water. The single most common cause of shrinkage, by a wide margin.

• Wringing. Twisting breaks the delicate structure and creates permanent creases.

• Tumble drying. Heat and tumbling together are close to a guaranteed disaster.

• Biological detergent. It attacks the protein directly, weakening the fabric over time even when nothing visibly goes wrong.

• Fabric softener. Coats the surface, kills the loft, reduces warmth.

• Hanging to dry. Gravity does what gravity does.

• Washing too frequently. Every clean shortens the life a little.

• Shock rinsing. Moving from warm wash water to a cold rinse in one step.

What to do if a garment has already felted

Honest answer first: if it has genuinely felted, it's gone. The scales have locked and no known process undoes that.

Slight shrinkage, though, is a different matter and is often recoverable. Soak the piece in cool water with a generous amount of hair conditioner for around thirty minutes, which relaxes the fibres, then reshape gently while damp, stretching a little at a time across the width. Dry flat under light tension.

Success varies. Sometimes you get most of the size back. Sometimes very little. Our guide on how to fix a shrunken sweater sets out the full process for anyone who wants to try.

Between Washes: Airing, Pilling and Storage

Most of what keeps cashmere in good condition happens on the days you're not cleaning it.

• Rest it: Wearing the same piece two days running doesn't allow the fibres to recover their shape. Rotating between two or three garments extends the life of all of them noticeably.

• Air it overnight: Lay it flat somewhere with moving air after wearing. This does more than any cleaning product for freshness.

• Deal with pills properly: All cashmere pills in the first weeks as short fibre ends work to the surface. Use a cashmere comb or a fine sweater stone, working in one direction under light pressure. Pulling pills off by hand takes good fibre with them.

• Store folded, never on a hanger: Fold along the existing seam lines and keep in a drawer or on a shelf. Add cedar blocks or lavender sachets, since moths are attracted to protein fibres and are far more of a threat than any washing basin.

• Store clean: Moth larvae feed on the traces of skin and food we leave behind, so putting a soiled garment away for summer is asking for trouble.

Similar principles apply across our other yarns, incidentally. If you also own British spun pieces, our guide to washing lambswool covers the small differences in handling, and there's a separate one on caring for merino that's worth a look if you travel with fine gauge layers.

Everything in our cashmere collection is spun by Todd & Duncan in Scotland and finished with hand washing in mind, and the same applies to our cashmere scarves and accessories.

Frequently Asked Questions

Can I use a washing machine instead of hand washing cashmere?

Sometimes, with conditions. Use a dedicated wool programme at 30°C or below, place the garment in a mesh bag, select the lowest possible spin or none at all, and use a non-biological detergent for delicates. Modern wool cycles limit drum rotation specifically to reduce felting. That said, the spin phase remains the main risk, and results vary considerably between machines. For anything you intend to keep for years, hand cleaning is the safer choice.

Does hand washing cashmere make it softer over time?

It generally does, yes. Gentle cleaning removes the tiny residues of skin oil and dust that stiffen the surface, and it allows the fibres to relax and bloom slightly. Many owners notice a piece feels better after its second or third clean than when new. Harsh detergents and dry cleaning solvents produce the opposite result, gradually stripping the natural oils and leaving the handle flat and slightly papery.

How much water can a cashmere jumper hold when wet?

Protein fibres absorb roughly 30% of their own weight in moisture, which is why a light jumper feels heavy coming out of the basin. That extra weight is precisely why you must support the garment with both hands rather than lifting it by the shoulders or a sleeve. Wet fabric stretches easily under its own load, and the distortion tends to be permanent once the piece dries in that shape.

Should cashmere blends be washed differently from pure cashmere?

Usually the more delicate component sets the rules. A cashmere and silk blend needs pH-neutral detergent, since alkaline products damage silk. Merino and cashmere blends tolerate handling slightly better than pure cashmere and often carry a machine wool cycle rating. Cotton blends are the most forgiving of all. Check the composition percentage on the label and treat the garment according to whichever fibre is fussiest, not whichever appears first.

Is it safe to iron cashmere after washing?

Light steaming is fine, direct pressing is not. Hold a steam iron a few centimetres above the surface and let the steam relax the fibres, then pat the fabric flat by hand. Direct contact flattens the loft permanently and can leave a shine on darker colours. Most creases fall out on their own during flat drying, so ironing is rarely necessary if the reshaping stage was done carefully.

How long should a hand-washed cashmere garment last?

With sensible handling, ten to fifteen years is realistic for a two-ply piece, and plenty last longer. Washing frequency, drying method and storage between seasons matter as much as the original quality. Garments cleaned two or three times a season, dried flat and stored folded typically outlast identical pieces washed monthly by a wide margin. Cuffs and elbows fail first, and both are friction points rather than washing casualties.

Final Thoughts

Cashmere is far less fragile than its reputation suggests. Keep the water cool, keep your hands slow, dry it flat, and the garment will look after itself for a decade or more.

If you're unsure about a specific piece, whether it's a blend, a heavier gauge, or something with an unusual construction, our team at Paul James Knitwear is happy to advise. We spin, knit and finish in our own family-owned factories in Leicestershire and India, which means the person answering knows how the garment was built and what it will tolerate. Contact the sales team for care advice, or for help choosing a piece that suits how you actually live in your clothes.