How to Wash and Clean a Cashmere Sweater: The Complete Care Guide
Why Cashmere Needs Different Care Than Regular Wool
Cashmere fibers are far finer than sheep's wool — often a third the diameter of a human hair. That fineness is exactly what makes cashmere so soft, but it also means the fiber has almost no structural give when it is wet. Hot water, agitation, and harsh detergent break down the scale structure on the fiber surface, and once that happens the damage does not reverse. A sweater that felts in a hot wash stays felted.
None of this makes cashmere hard to care for — it just means the process is gentler and slower than a normal laundry cycle. Once you know the routine, washing a cashmere sweater takes about the same effort as any hand wash. See our guide on what cashmere actually is for more on why the fiber behaves this way.
Step-by-Step Hand Washing Guide
- Check the care label first. Most cashmere is hand-wash safe, but a few blends specify dry clean only. When in doubt, hand wash a small hidden area first, like the inside hem.
- Turn the sweater inside out. This protects the outer surface from friction during washing and cuts down on pilling.
- Fill a basin with cool or lukewarm water. Add a cap of a wool-specific detergent (or a mild baby shampoo in a pinch). Skip regular laundry detergent — it's too alkaline for animal fibers.
- Submerge the sweater and let it soak 20–30 minutes. This lets the detergent work without any rubbing or scrubbing.
- Gently press the fabric through the water. Use an open palm to move water through the sweater. Never rub, twist, or wring — cashmere is at its weakest when saturated.
- Rinse thoroughly. Drain the soapy water, refill with clean water at the same temperature, and press the sweater through it. Repeat two or three times until no suds remain.
- Remove excess water with a towel roll. Lay the sweater on a dry towel, roll it up like a burrito, and press down gently. Unroll and repeat with a fresh towel if needed. Never wring the sweater to remove water.
- Reshape and dry flat. Lay the damp sweater on a fresh dry towel or mesh drying rack, gently coax it back to its original shape and measurements, and let it air dry away from direct heat or sunlight.
Machine Wash vs. Hand Wash
| Factor | Hand Wash | Machine Wash (Wool Cycle) |
|---|---|---|
| Fiber safety | Safest option | Acceptable only in a mesh bag on a wool/delicate cycle |
| Risk of felting | Very low | Higher — even gentle agitation adds risk |
| Time required | 30–40 minutes | Faster, but needs full attention to settings |
| Best for | Any cashmere piece | Sturdier, higher-ply knits only |
| Recommendation | Preferred method | Use only if hand washing isn't practical |
Removing Stains From Cashmere
General approach: treat any stain as soon as possible, and always blot — never rub, which pushes the stain deeper into the fiber and roughs up the surface.
Food and beverage stains: blot excess liquid immediately, then dab the area with a small amount of wool-safe detergent diluted in cool water. Work from the outside of the stain inward so it doesn't spread.
Oil and grease: sprinkle cornstarch or talcum powder on the spot and let it sit for a few hours to absorb the oil, then brush off and hand wash normally. Avoid hot water, which can set oil-based stains permanently.
Ink and makeup: these are the hardest stains to remove and often need a specialist. If you want to try at home, dab (don't rub) with a small amount of isopropyl alcohol on a cotton pad, testing on an inside seam first, then hand wash immediately after.
Drying Cashmere Properly
Never tumble dry. Heat and tumbling together are the fastest way to shrink and felt cashmere permanently.
Never hang to dry. A wet sweater on a hanger will stretch under its own water weight, and the stretch does not shrink back.
Flat dry only. Lay the sweater on a towel or mesh rack, reshape it while damp, and let it dry undisturbed. Flip it partway through if the room is humid, and keep it out of direct sun, which can fade color and dry the fiber unevenly.
Storing Cashmere Between Seasons
Fold cashmere — never hang it. Hanging stretches the shoulders and neckline out of shape over weeks and months.
Use cedar blocks or lavender sachets in your storage drawer or bin. Moths target natural fibers, and cashmere is one of their favorites.
Always store cashmere clean. Body oils and invisible food residue attract moths even when a stain isn't visible, so wash before you pack a sweater away for the season.
Use breathable cotton garment bags rather than sealed plastic, which traps moisture and can encourage mildew.
Common Mistakes That Ruin Cashmere
- Washing in hot water
- Wringing or twisting the wet fabric
- Using regular laundry detergent instead of a wool-safe formula
- Washing after every single wear, which wears down the fiber faster than it needs to
- Ignoring early pilling instead of combing it out gently
- Drying with any heat source, including radiators and hair dryers
Do's and Don'ts
Do: hand wash in cool water, use wool-safe detergent, dry flat, store folded, air out between wears.
Don't: use hot water, wring or twist, tumble dry, hang to dry or store, use bleach or fabric softener.
Myth vs. Fact
Myth: Cashmere is dry clean only. Fact: most cashmere hand washes safely at home. Dry cleaning is a convenience option, not a requirement, and the harsh solvents used by some cleaners can actually dull the fiber over time.
Myth: Fabric softener keeps cashmere soft. Fact: fabric softener coats the fiber with a residue that actually reduces cashmere's natural softness over time. A wool-safe detergent is all you need.
Myth: Cashmere always shrinks. Fact: cashmere only shrinks from heat and agitation. Washed cool and dried flat, it holds its size wash after wash.
Myth: Pilling means the sweater is low quality. Fact: some pilling is normal even on excellent cashmere, especially in the first few wears. A cashmere comb resolves it in minutes. See our guide on how cashmere yarn is graded for more on what actually separates high- and low-quality fiber.
Quick Care Checklist
- Check the label before washing
- Use cool water and wool-safe detergent
- Soak, don't scrub
- Press out water, never wring
- Dry flat, out of direct heat and sun
- Fold for storage with cedar or lavender
- Wash before long-term storage
Frequently Asked Questions
Can I wash cashmere in a washing machine?
Yes, on a wool or delicate cycle inside a mesh laundry bag with cold water, though hand washing is gentler and lower risk.
How often should I wash a cashmere sweater?
Only after several wears, or when it's visibly soiled. Airing it out between wears is usually enough.
What detergent is safe for cashmere?
A wool-specific detergent, or a mild, pH-neutral soap like baby shampoo. Avoid regular laundry detergent.
Can I use fabric softener on cashmere?
No. It leaves a residue that dulls the fiber's natural softness rather than enhancing it.
Is it okay to iron cashmere?
Only on a low setting with a pressing cloth between the iron and the sweater, and steam works better than direct heat.
Why did my cashmere sweater shrink?
Almost always heat — either hot wash water or a dryer. Cool water and flat drying prevent shrinkage.
How do I get rid of pilling?
Use a cashmere comb or fabric shaver, working gently in one direction over a flat surface.
Can I spot clean instead of washing the whole sweater?
Yes, for small fresh stains. Dab the area with diluted wool-safe detergent rather than washing the entire garment.
How long does it take cashmere to air dry?
Usually 12–24 hours flat, depending on humidity and the sweater's thickness.
Should I store cashmere in plastic bags?
No. Use breathable cotton bags — plastic traps moisture and can lead to mildew.
What causes moth holes and how do I prevent them?
Moths lay eggs in natural fibers, especially soiled ones. Store cashmere clean with cedar or lavender to deter them.
Can I dry clean cashmere instead of hand washing?
Yes, it's a safe alternative, though repeated dry cleaning with harsh solvents can dull the fiber over years of use.