How to Wash 100% Cashmere? | The Gentle-Care Method

Hand-washing 100% cashmere in cool water with a wool-specific detergent is the safest way to clean it without shrinkage or damage.

Cashmere’s delicate knit structure punishes mistakes quickly — hot water, wringing, or a spin cycle can stretch and distort a sweater beyond repair. Knowing how to wash 100% cashmere properly comes down to one principle: treat it like the fragile fabric it is. The good news is the correct method takes about fifteen minutes of hands-on time, and the results beat any dry-cleaning bill.

Can You Machine Wash 100% Cashmere?

Machine washing 100% cashmere is acceptable only when the garment’s care label explicitly permits it. A wool cycle does not override a hand-wash-only instruction — the label is the final authority.

When the label allows machine washing, use the wool or delicates cycle with cold water, place the sweater inside a mesh laundry bag, and select the lowest spin speed. Skip fabric softener entirely; it coats the fibers and reduces cashmere’s natural softness over time.

Step-By-Step: Hand-Washing Any Cashmere Garment

Hand-washing is the gentlest route and works for every cashmere item, regardless of what the label says. The New York Times’ Wirecutter recommends a lukewarm-water soak of about fifteen minutes using a no-rinse detergent or baby shampoo; John Lewis echoes the lukewarm water and adds a cold-water rinse.

1. Fill a sink or basin with cool or lukewarm water — never hot.
2. Add a small amount of gentle wool/cashmere detergent, no-rinse detergent, or baby shampoo, and swish to disperse.
3. Submerge the sweater and let it soak for 5–15 minutes. Gently press and swish the fabric to release dirt; do not scrub or stretch it.
4. Drain the soapy water and refill with fresh cool water. Rinse until the water runs clear and all detergent is gone.
5. Press water out without wringing or twisting. Gently squeeze, then roll the sweater in a clean towel and press to absorb excess moisture.
6. Reshape the garment on a flat drying rack or dry towel. Pull it gently back to its original dimensions, and let it dry completely away from heat and direct sunlight.

Never hang cashmere to dry — the weight of wet fabric stretches it out of shape permanently. And never tumble-dry it; the heat and agitation cause felting and shrinkage beyond repair.

If you’re in the market for a new sweater rather than reviving an old one, our tested roundup of the best 100% cashmere sets compares quality, weight, and care requirements across leading brands.

Common Cashmere-Washing Mistakes To Avoid

Most cashmere damage comes from a handful of preventable errors. Steering clear of these keeps your sweater looking new for years:

• Hot water — shrinks and felts the delicate fibers.
• Wringing or twisting — distorts the knit structure permanently.
• Hanging to dry — gravity stretches wet cashmere.
• Fabric softener — coats fibers and dulls the natural softness.
• Harsh or enzyme-based detergents — break down the protein fibers.
• Tumble-drying — heat plus agitation is the fastest way to ruin cashmere.

Airing the sweater between wears and spot-cleaning small marks with a damp cloth reduces how often you need a full wash.

FAQs

How Often Should You Wash A Cashmere Sweater?

Cashmere does not need washing after every wear. Most sweaters need a wash only every four to six wears, or when they pick up visible marks or odors. Airing the garment overnight between wears removes most moisture and keeps it fresh, which stretches the time between washes and protects the delicate fibers from unnecessary handling.

Can You Use Regular Laundry Detergent On Cashmere?

Regular laundry detergent is risky for cashmere. Standard detergents often contain enzymes and brighteners that break down protein fibers over time, leaving the sweater rougher and less durable. A dedicated wool or cashmere detergent, or a gentle no-rinse formula, is purpose-built for delicate knits and is the safer choice. Baby shampoo also works in a pinch.

What Happens If Cashmere Gets Wet?

Wet cashmere is at its most vulnerable because water weakens the fibers and adds significant weight. This combination makes the garment stretch easily under its own weight. Handle wet cashmere with care — support it fully when lifting, press water out rather than wringing, and lay it flat to dry. Proper handling prevents distortion and keeps the original shape intact.