Quick Answer
Wash cashmere by hand in cold water (under 20 degrees Celsius or 68 Fahrenheit) with a pH neutral wash like baby shampoo or a delicates detergent. Submerge the inside out sweater, press gently with your palms for 10 minutes, rinse, roll in a clean dry towel to absorb water, then reshape and dry flat on a fresh towel for 24 to 48 hours. Never wring, twist, hang wet, or tumble dry.
Skip the dry cleaner unless the label specifically requires it. Most cashmere actually prefers gentle hand washing because dry cleaning solvents slowly strip the natural oils out of the fibres.
Why cashmere needs special care
Cashmere is the fine downy undercoat of the cashmere goat (Capra hircus), combed out by hand each spring. The individual fibres are about 14 to 19 microns thick, far finer than standard sheep wool, which is what gives the fabric its cloud like softness and roughly three times the warmth of wool of the same weight. That fineness is also its weakness. The fibres are short, smooth, and easily damaged by heat, friction, and harsh chemicals.
Throw a cashmere sweater into a regular washing machine cycle and three things happen. The hot or warm water makes the microscopic scales on each fibre lift up. The mechanical agitation of the drum forces those raised scales to interlock with neighbouring fibres. The fabric shrinks and felts permanently. There is no way back from felting, so prevention is the whole game.
What you need
- A clean bathroom sink or laundry basin.
- Cold water (run the tap until it is genuinely cold, ideally under 20 degrees Celsius).
- A pH neutral delicate wash. Brands like Eucalan, The Laundress Wool and Cashmere, or Soak Wash are designed for this. A pinch of pure unscented baby shampoo also works.
- Two large clean dry towels.
- A flat drying rack or a clean flat surface.
Step 1: prep the bath
Fill the sink with enough cold water to fully submerge the garment with room to move. Add one tablespoon of delicate wash and swirl the water gently with your hand until the soap dissolves. Do not use regular laundry detergent. Most detergents are alkaline (pH 8 to 10) and contain protease enzymes designed to digest organic stains. Cashmere is a protein fibre, so those same enzymes will literally eat the fabric over time, leaving the surface coarse and lifeless.
Step 2: turn the sweater inside out and submerge
Turning the sweater inside out protects the outer face from any incidental friction during washing and drying. Lower the sweater into the soapy water and use your palms to press it gently downward until it is fully saturated. Let it soak undisturbed for 10 minutes. The cold water and gentle soap will lift dirt and body oils out of the fibres on their own, no scrubbing required.
Step 3: press, never rub
To dislodge any remaining grime, press the sweater against the bottom of the sink with open palms and release. Repeat 10 to 15 times. Imagine you are gently pumping the soapy water through the knit loops. Never rub the fabric against itself. Friction is exactly what causes pilling, those small balls of tangled fibre that ruin the look of a sweater. Never lift the sweater by the collar either, the weight of the water will stretch the neckline out of shape immediately.
Step 4: rinse twice
Drain the sink. Refill with clean cold water. Press the sweater gently as before to flush out the soap. Drain and repeat once more. Any soap residue left behind will dry stiff and attract dirt.
Step 5: the towel roll
Lift the sweater out of the sink by supporting its full weight from underneath with both hands, never pinch it by one corner. Gently press water out against the sink wall, but do not wring or twist.
Lay a large dry bath towel flat on the floor or a table. Lay the damp sweater flat on top, smoothing it into roughly its original shape. Roll the towel and sweater together tightly from one end into a long cylinder. Press down firmly along the length of the roll with your hands or walk on it gently in clean socks. The dry towel absorbs most of the deep moisture in 60 seconds. Unroll, peel the sweater off the now damp towel, and move to the drying step.
Step 6: dry flat and reshape
Lay a second dry towel or an open mesh sweater drying rack on a flat surface in a well ventilated room, away from direct sun, radiators, or hot air vents. Lay the sweater flat. Use your fingers to align the shoulders, smooth the sleeves to their original length, and pat the body into rectangular shape. This is the moment to undo any minor stretching that happened during washing.
Leave it for 24 to 48 hours depending on humidity. Flip it over once at the halfway point so both sides dry evenly. Never hang a wet cashmere sweater on a coat hanger. The weight of the water will pull the wet shoulders downward and leave permanent hanger bumps and a sagging hem.
Storage and pilling care
Fold clean cashmere with tissue paper between the layers and store flat in a drawer. Add a cedar block or lavender sachet, moths love cashmere. To remove pills, use a fabric comb or a battery powered fabric shaver in light passes. Do not pull pills off with your fingers, that snaps individual fibres.
How often to wash
Cashmere is naturally odour and stain resistant. Wash a sweater only every 4 to 6 wears, or whenever it actually needs it. Air it out overnight between wears and it will stay fresh for a week of wear easily. Less washing means a longer life.
The takeaway
Cashmere is not as fragile as the dry cleaner wants you to think. Cold water, a mild delicate wash, gentle compression instead of rubbing, a towel roll, and flat drying are all it takes to keep a sweater soft, properly sized, and pill resistant for many years. Skip the machine, skip the dryer, and your investment piece will outlast almost everything else in your wardrobe.
