KNITWEAR CARE SERIES · HOW TO WASH CASHMERE

KNITWEAR CARE SERIES · HOW TO WASH CASHMERE

Cool water, pH-neutral detergent, 10 minutes, zero agitation. Almost everything that damages cashmere happens in the first 60 seconds of a wash.

How to Wash Cashmere: The 60-Second Version

If you only remember one table, remember this one. Cashmere is a protein fiber — structurally closer to your hair than to cotton — which is why it responds to heat, pH and friction so dramatically.

Before You Wash: Three Checks That Save Sweaters

1. Read the care label — and trust it over this article

Most quality cashmere is hand-washable. But structured pieces with linings, padding, shoulder pads, heavy embroidery, sequins or multiple dyed color blocks may genuinely need dry cleaning, because water can distort the construction or bleed dye between panels. If the label says "dry clean only" on a plain knit, the brand is usually being cautious — but respect any specific instruction that came with the garment.

2. Decide whether it actually needs washing

Cashmere does not need a wash after every wear. Worn over a shirt or for a few hours, it usually needs airing, not water. Between wears, hang it somewhere ventilated for at least 24 hours so the fibers recover their loft and any moisture evaporates.

3. Pre-treat spots with cold water only

Dab a small amount of wool-safe detergent onto the stain with your fingertips, let it sit for a couple of minutes, and blot with cool water. Do not rub the spot — rubbing spreads the stain and roughs up the surface, which is exactly where pills form first.

How Often Should You Wash a Cashmere Sweater?

Every 3 to 6 wears for a sweater worn over a base layer; closer to 3 if you wear it directly against skin, in warm offices, or in a city with heavy air pollution. Cashmere's lanolin structure and the air between its crimped fibers mean it resists odor and stains far better than cotton or synthetics. What it does not resist is friction.

Ewsca insider note: In our factory, the sweaters that survive the longest in customer testing are almost never the ones washed most often — they are the ones washed correctly, at cooler temperatures and with the least agitation. We knit 2-ply yarn from Inner Mongolian cashmere precisely because the longer staple fiber sheds less loose fiber to begin with. Good construction buys you time; good care keeps it.

What You Need Before You Start

• A clean basin or sink. Ceramic, glass or plastic — avoid a metal sink if you can, as it can react with detergent and leave marks on pale cashmere.
• A pH-neutral wool or cashmere wash. Or additive-free baby shampoo as a fallback. One to two teaspoons is plenty for a sweater.
• Two clean towels — ideally microfiber, which absorbs fast and has a smooth surface that will not snag the knit.
• A flat drying rack or mesh net. Not a hanger. Not the radiator. Not a line.
• A cashmere comb for after drying. An optional but excellent investment if you own more than two cashmere pieces.

How to Hand Wash a Cashmere Sweater in 7 Steps

This is the method we recommend to every brand and end customer we work with. It takes about 20 minutes of attention plus drying time.

Step 1: Fill a basin with cool water — 30°C / 86°F maximum

If you cannot measure, use water that feels barely warm to the touch. Lukewarm helps the detergent dissolve; cold water works too and is never wrong. The single most important number in cashmere care is 30°C.

Step 2: Add a pH-neutral wool or cashmere detergent

One to two teaspoons for a basin. Stir it gently — you want almost no foam. Excessive suds are hard to rinse out, and detergent residue is what leaves cashmere feeling stiff and grabbing dirt faster next time.

Step 3: Turn the sweater inside out and submerge it

Turning it inside out protects the surface fibers — the ones visible to your customer — from friction. Press the sweater down gently with open palms until it is fully saturated. Do not pour water directly onto the fabric.

Step 4: Soak for 10 minutes — press, never rub

Ten minutes is enough to lift body oils and light soil. If you want to be thorough, 20–30 minutes is the safe outer limit; beyond that the fiber weakens. For collars and cuffs, press the fabric between your palms rather than scrubbing it. Never use a brush.

Step 5: Rinse at the same temperature until the water runs clear

Drain, refill with clean water at the same temperature, and press again. Repeat two to three times. A sudden change in temperature shocks the fiber as much as hot water does. If you see any suds in the water, keep rinsing — soap left in the knit is a common reason a sweater feels "ruined" after a good wash.

Step 6: Remove the water with a towel — not a wring

Lift the sweater with both hands supporting its full weight; wet cashmere stretches under its own mass if you hold one end. Press it gently against the basin side, then lay it flat on a dry towel, fold the towel over, and roll the whole thing up like a Swiss roll, pressing as you go. The towel does the work. Wringing breaks fibers and is the fastest way to distort a shoulder line.

Step 7: Dry flat, reshape while damp, wait 12–24 hours

Transfer the sweater to a mesh drying rack or a fresh towel. While it is still damp, ease the sleeves, hem and neckline back into their original dimensions — this is your one chance to correct small distortions. Keep it away from radiators, direct sunlight and hair dryers: heat shrinks, and sunlight fades color. It will take 12 to 24 hours to dry fully.

Flat drying is not optional. Hanging a wet sweater puts the full weight of the water on the shoulder seams — that is where "hanger bumps" come from, and they never fully come out.

Can You Machine Wash a Cashmere Sweater?

Sometimes — and only when the label allows it. Machine washing is acceptable when you control the three variables that matter: temperature, agitation and spin speed.

• Turn the sweater inside out and put it in a fine mesh laundry bag.
• Select a cold wool or delicate cycle, and set the spin to the lowest speed or turn it off entirely.
• Wash it alone or with similar light-colored knits — never with jeans, towels or anything with zips and hooks.
• Use a wool-safe detergent, and remove the sweater the moment the cycle ends. Leaving it damp in the drum is how mildew and creases happen.

Hand washing still gives more control, and it is the right call for fine-gauge, loosely knit or very light-colored cashmere.

Ewsca insider note: Machine washability is decided at the yarn and finishing stage, not at the care label. We produce a dedicated machine-washable cashmere range for brands whose customers want a sweater they can throw in with the wool cycle. If you want that claim on your label, tell us at the design stage — it affects yarn selection, knitting density and the finishing process, so it cannot be added afterwards.

Hand Wash vs Machine Wash vs Dry Clean

The 5 Fastest Ways to Ruin a Cashmere Sweater

1. Hot water. Felting is a chemical-scale change in the fiber, not a temporary stretch problem. Once cashmere has felted, no home method brings it back.
2. Regular or enzyme detergent. Alkaline pH plus protease enzymes breaks down a protein fiber. It will not fail in one wash; it fails over a season.
3. Wringing and twisting. The fiber is fine and short. Twisting snaps it, and broken fiber ends are exactly what tangles into pills.
4. Hanging it wet. Water weight plus gravity equals permanently stretched shoulders and hem.
5. The tumble dryer. Even on low heat, the tumbling motion is the agitation that felting needs, and the heat does the rest. Never.

Add one more to the list: fabric softener. It feels like a kindness, but it coats the fiber, reduces the natural breathability of the knit and builds up residue that makes cashmere feel claggy rather than soft.

Can You Unshrink a Cashmere Sweater?

An honest answer, because a lot of content on this topic promises more than is possible.

If your sweater has felted — the fibers have interlocked and the surface looks dense, matted and slightly stiff — the change is permanent. No conditioner, no vinegar, no stretching routine will restore it. That is a fiber-level transformation.

If the sweater has only relaxed or tightened slightly, it is often recoverable. Soak it in cool water with a small amount of hair conditioner for 20 minutes to relax the fibers, then lay it flat on a towel, ease it back to its original measurements using a tape measure, not a guess, and let it dry flat untouched. Repeat once if needed. Keep the sweater afterward for low-friction wear rather than daily rotation.

How to Stop Cashmere from Pilling (and Remove Pills Safely)

First, the reframe that most care articles get wrong: pilling is not a defect. Cashmere's short, fine fibers migrate to the surface under friction and tangle into small balls. A new sweater pilling in the first weeks is normal and usually settles down. What you can control is how fast it happens and how you remove it.

Reduce the cause: friction

• Know the friction zones: under the arms, along the side panels, at the cuffs, and anywhere a bag strap, seatbelt or desk edge touches the knit.
• Layer strategically: a silk or cotton layer between coat and sweater absorbs the abrasion instead of your cashmere.
• Rest the garment 24 hours between wears so the fibers settle back into position.
• Choose 2-ply, longer-staple yarn when you buy. Ply and staple length are the biggest determinants of how much a sweater pills over its lifetime — more than price, more than country of origin alone.

Remove the result: the tool comparison

The technique: lay the sweater flat on a hard surface, hold the fabric taut with one hand, and draw the comb in one direction with light pressure. Work only on a completely dry garment. Best practice is to comb a new sweater lightly after its first two or three wears — that clears the short manufacturing fibers most likely to pill and typically reduces pilling for the rest of the sweater's life.

A cashmere comb and a cedar block cost less than one dry-cleaning bill and will add years to a sweater's life.

How to Store Cashmere So It Survives to Next Winter

Storage is where most cashmere is quietly lost — not to washing, but to moths and hangers.

• Always fold, never hang. Gravity pulls the shoulder seams and creates permanent "hanger bumps". Fold in thirds, arms across the body.
• Wash before you store. Clothes moth larvae feed on keratin and are drawn to residual skin oils, perfume and food traces. A clean sweater is an unappealing target.
• Use breathable containers. Cotton garment bags or acid-free boxes. Avoid sealed plastic, which traps moisture and can cause mildew or yellowing over a season.
• Deter moths naturally. Two to three cedar blocks or a lavender sachet per container. Cedar's scent fades in about 3–6 months — sand the surface lightly to reactivate it. Skip mothballs; cashmere holds that chemical smell for weeks.
• For a suspected infestation, freezing works, but only at −18°C (0°F) for at least two weeks. Bag the sweater first to prevent condensation.
• Do not vacuum-compress long term. Great for shipping, damaging for storage: compression crushes the fiber structure and sets deep creases.

What This Means for Brands: Care Labels, Returns and Reviews

If you are sourcing private label knitwear, washing instructions are not an afterthought — they are a returns-prevention tool and, increasingly, a selling point.

• Get the care label right. If the garment is hand-wash only, say so; if you want to claim machine washable, the yarn and finishing must be specified for it from the beginning.
• Insert a care card. A printed card with the 7 steps above measurably reduces "it shrank in the wash" complaints and the one-star reviews that follow them.
• Consider machine-washable cashmere as a differentiator. For younger customers and gifts, "you can wash it" removes the single biggest purchase objection in the category.
• Let the care label reinforce your certification story. OEKO-TEX and SFA-compliant production is a claim customers can verify — and care instructions are where they engage with it most.

At Ewsca we develop custom cashmere sweaters, cardigans, kidswear and home pieces with care labels, wash-testing and packaging inserts handled as part of the order. If you want to build a product line where the after-care experience matches the product itself, start a conversation with our team.

Frequently Asked Questions

How do you wash a cashmere sweater without shrinking it?

Cool water at 30°C or below, pH-neutral detergent, 10 minutes of soaking, minimal handling, and flat drying. Shrinkage is caused by heat plus agitation, so eliminate both. Never wring, never hang wet, never tumble dry.

What temperature should you wash cashmere at?

30°C (86°F) or cooler — cool to lukewarm. Use the same temperature for washing and rinsing, because a sudden temperature change shocks the fiber as much as heat does.

Can you wash cashmere in a washing machine?

Only if the care label permits it. Inside out, in a mesh bag, on a cold wool or delicate cycle, with the spin off or at its lowest setting, and removed immediately when the cycle ends.

Can I use regular laundry detergent or fabric softener on cashmere?

No. Regular detergents are alkaline and often contain enzymes that degrade the protein fiber; fabric softener coats the fibers and builds up residue. Use a pH-neutral wool or cashmere wash, or additive-free baby shampoo.

How often should you wash a cashmere sweater?

Every 3 to 6 wears. Air it out for at least 24 hours between wears instead. Over-washing adds friction and is one of the leading causes of pilling.

Is dry cleaning better than hand washing for cashmere?

Not for a plain sweater — hand washing preserves softness better, and repeated dry cleaning can leave the fiber feeling dry and flat. Dry cleaning is the right choice for lined, padded, heavily embellished or multi-panel dyed pieces.

How do you remove pilling from a cashmere sweater?

Lay it flat, hold the fabric taut, and draw a cashmere comb across the pilled area in one direction with light pressure. An electric shaver is faster on heavy pilling but must never be pressed down. Never use a razor.