How To · Fashion · Care
How to wash and care for wool and cashmere cardigans
Wool and cashmere cardigans deserve better than the dry cleaner every time. With the right technique, you can hand-wash them at home and keep them looking pristine for years.
5 min read · IrisWool and cashmere cardigans are investments. Unlike cotton or synthetics, these natural fibers respond poorly to machine washing, heat, and harsh chemicals. The good news: hand-washing at home is simpler than you think, costs almost nothing, and actually extends the life of your cardigan by years.
The key is understanding that these fibers are delicate not because they're fragile, but because they're structured. Agitation, heat, and alkaline detergents cause the scales on the fiber to lift and lock together—that's how pilling and shrinking happen. Follow this method and you'll avoid both.
Cashmere and wool don't need to be washed after every wear. Airing them out between wears is often enough.
What you'll need.
- 01Basin or sink
- 02Wool-specific detergent or baby shampoo
- 03Cool water (65–75°F)
- 04Clean dry towels
- 05Sweater drying rack (optional but recommended)
- 06Soft-bristled brush or lint roller
Prep and spot-check · 2 minutes
Inspect and spot-treat stains first
Lay your cardigan flat on a clean surface and examine it for stains, pilling, or loose threads. If you see a stain, gently dab it with a barely damp cloth and a tiny drop of wool-specific detergent before the full wash. Check pockets and cuffs for debris. This prevents you from setting stains during the wash cycle.
Use a soft-bristled brush or lint roller to remove surface dust and loose fibers before washing.
Fill and dissolve · 3 minutes
Prepare cool soapy water
Fill a clean basin or sink with cool water—aim for 65–75°F (18–24°C). Hot water opens the fiber scales and causes shrinking. Add 1 teaspoon of wool-specific detergent or baby shampoo (never regular laundry detergent, which is too alkaline). Stir gently to dissolve completely. The water should smell lightly soapy, not strongly of detergent.
Cashmere is more delicate than wool. If washing cashmere, use half the detergent amount.
Submerge and soak · 5 minutes
Soak the cardigan gently
Fold your cardigan loosely and submerge it fully in the soapy water. Press down gently so water penetrates the fibers, but do not agitate, wring, or scrub. Let it soak for 5 minutes. This allows the detergent to lift dirt and oils without mechanical damage. If the water looks visibly dirty after soaking, that's normal—the fibers are releasing trapped dust and body oils.
Never let a wet cardigan sit in water longer than 10 minutes, as prolonged soaking can weaken fibers.
Rinse thoroughly · 4 minutes
Remove all soap residue
Drain the soapy water carefully. Refill the basin with fresh cool water and gently press the cardigan against the bottom and sides to rinse. Drain and repeat 2–3 times until the water runs clear and smells clean. Soap residue dulls fibers and causes stiffness, so this step is non-negotiable. The final rinse should be pristine.
If your tap water is very hard, add a tiny splash of white vinegar to the final rinse to restore softness and shine.
Remove excess water · 2 minutes
Gently extract moisture without wringing
Lift the cardigan from the water and hold it gently over the basin to let water drip. Lay it flat on a clean, dry towel. Fold the towel over the cardigan and press gently—do not wring or twist. The towel will absorb excess water. If needed, use a second dry towel and repeat. The cardigan should feel damp but not dripping.
Never hang a wet wool or cashmere cardigan. The weight of the water will stretch it out of shape permanently.
Dry flat · 24 hours
Air-dry on a flat surface
Lay the damp cardigan flat on a clean, dry towel or sweater drying rack in a well-ventilated area away from direct sunlight, heat, or radiators. Smooth it gently into its original shape. Flip it halfway through drying (after 12 hours) to ensure even moisture evaporation. It should be completely dry within 24 hours. Once dry, fold and store it away from direct light.
If you don't have a sweater rack, lay it on a clean bed or use a folded towel on a table. Ensure air can circulate underneath.
How to know your cardigan is clean and ready to wear
A properly washed cardigan will feel soft, smell fresh, and retain its original shape and color. The fibers should lie flat without pilling or matting. If it feels stiff or smells like detergent, you've either used too much soap or didn't rinse thoroughly enough.
Questions at the mirror.
My cardigan shrunk after washing. Can I fix it?
Shrinkage is difficult to reverse, but you can try this: soak the cardigan in cool water with a capful of hair conditioner for 15 minutes, gently stretch it back to size, and lay it flat to dry. This works best on minor shrinkage. For significant shrinkage, consult a professional restorer.
Should I wash my cardigan after every wear?
No. Wool and cashmere are naturally resistant to odor and bacteria. Wash only when visibly soiled or after 4–6 wears. Between washes, hang it outside to air out or lay it flat in a well-ventilated space. This extends the time between washes and reduces fiber stress.
What's the difference between wool and cashmere care?
Cashmere is finer and more delicate than wool, so use less detergent and handle it even more gently. Both follow the same hand-wash method, but cashmere benefits from occasional conditioning rinses with hair conditioner to restore softness.
Can I use regular laundry detergent?
Avoid it. Regular detergent is too alkaline and will damage the fiber structure. Use wool-specific detergent, baby shampoo, or even gentle hair conditioner. These are pH-neutral and designed for delicate fibers.