Short answer: wool, cashmere and silk are protein fibres and linen is a cellulose fibre, so they fail in different ways. Three things do almost all the damage: heat, agitation and leaving them sitting in enzyme detergent. Wash all four cold, keep the spin at 600 rpm or below, keep detergent contact under ten minutes for wool and silk, and dry flat. Done that way, a cashmere jumper can be washed at home for years without felting, matting or losing shape.
The three things that actually ruin delicates
- Heat. Wool and cashmere fibres are covered in microscopic scales. Heat opens them, agitation locks them together, and the result is felting: a jumper two sizes smaller with a dense, fuzzy surface. It cannot be reversed.
- Agitation, especially the spin. People blame the wash and it is usually the spin. A 1,400 rpm extraction stretches wet knit and sets creases into silk. Cycle name matters less than the number on the spin dial.
- Long contact with enzymes. Protease is the enzyme that breaks down protein soil, and wool and silk are protein. In a normal wash cycle this is a non-issue, because contact is short and dilution is high. In an overnight soak it is not. Keep wool and silk in detergent for five to ten minutes, then rinse properly.
That third point is the one most guides get wrong in both directions. Enzyme detergent is not banned from delicates; it just is not a soaking product. If you wash wool weekly, a dedicated wool wash alongside your normal detergent is a reasonable thing to own.
Wool and cashmere
Knitwear needs washing far less often than people think: every three to five wears for a jumper, immediately for anything that has been slept in or sweated through. Between washes, air it overnight on a flat surface. Airing removes most odour, because the smell is bacteria drying out on the surface, not deep in the yarn.
Machine method. Wool or delicate cycle, 20 to 30 °C, spin 400 to 600 rpm, mesh bag, drum no more than half full. Dissolve the pod in the drum with water running for thirty seconds before the garments go in.
Hand method, for anything you care about.
- Fill a basin with cool water, around 20 °C. Dissolve a pod fully; never put an undissolved pod against knitwear.
- Submerge the garment and press it gently under the surface for two to three minutes. No rubbing, no swirling, no wringing.
- Drain and refill with clean cool water. Press again. Repeat until the water runs clear, usually twice.
- Lift the garment supporting its whole weight, then press it between two towels. Never hold wet knit by the shoulders.
- Reshape flat on a dry towel, away from radiators and direct sun. Turn it once. Expect 12 to 24 hours.
Never: tumble dry, hang wet, wash with anything carrying a zip or hook, or use chlorine bleach. For pilling, use a cashmere comb or a fabric shaver on a flat surface rather than pulling bobbles off by hand.
Silk
Silk is washable, and most "dry clean only" silk is washable too, provided the wash tub on the label is not crossed out. The decoder for that is in laundry symbols explained.
- Water: cool, 20 °C. Hot water dulls the surface permanently.
- Detergent: a fully dissolved pod, short contact, thorough rinse. No chlorine bleach, no oxygen bleach, no optical brighteners.
- Rinse trick: a tablespoon of white vinegar in the final rinse removes detergent film and restores the fibre's shine, then rinse once more with plain water.
- Water extraction: roll in a towel and press. Never wring, never twist.
- Drying: flat or on a padded hanger, in the shade. Direct sun yellows white and ivory silk within hours.
- Ironing: inside out, two dots, while still slightly damp, with a pressing cloth. No steam bursts on to the surface.
- Deodorant and perfume: both mark silk and both set with time. Rinse the area cold the same day; do not wait for laundry day.
Linen
Linen is the opposite case: it is stronger wet than dry, and it improves with every wash. The enemies are heat, overloading and impatience.
- Machine wash cold to 40 °C on a normal or permanent-press cycle. Linen tolerates agitation.
- Fill the drum half full. Linen creases where it is compressed, and a packed drum sets those creases permanently in the dryer.
- Use a low spin, 600 to 800 rpm. Less water extraction means fewer creases, at the cost of a longer dry.
- Line dry, or tumble on low and remove while still slightly damp. Shake the garment out and hang it; the weight of the fabric finishes the job.
- Iron damp, on three dots, or skip ironing entirely if you like the texture. Both are correct.
- Skip softener permanently. Linen softens mechanically, and softener coats the fibre so it stops breathing.
- Expect 3 to 4 percent shrinkage on the first wash unless the label says pre-shrunk. Buy accordingly.
The whole thing as one table
| Fibre | Water | Cycle and spin | Dry | Wash every |
|---|---|---|---|---|
| Wool | 20 to 30 °C | Wool or delicate, 400 to 600 rpm | Flat, reshaped | 3 to 5 wears |
| Cashmere | 20 °C, hand preferred | Hand wash, or delicate at 400 rpm | Flat, out of sun | 3 to 5 wears |
| Silk | 20 °C | Hand wash, or delicate at 400 rpm | Shade, flat or padded hanger | 1 to 2 wears |
| Linen | Cold to 40 °C | Normal, 600 to 800 rpm | Line dry, or low heat then damp-hang | 1 to 3 wears |
How to load a delicate wash
- Half a drum, never more. Delicates need water and space, not company.
- Mesh bags for knitwear, lingerie and anything with straps.
- Group by weight. A wet towel in a knitwear load is a hammer.
- Close every zip, fasten every hook, and keep denim out entirely.
- Remove the load the moment it stops. Wet delicates left in a drum crease, stretch and start to smell within an hour, which is the mechanism behind clothes that still smell after washing.
Keeping fragrance on clothes that never see a dryer
Delicates skip the dryer, so they skip the second fragrance layer a dryer sheet provides. Everything therefore depends on the wash and on storage.
- Wash cold. Heat drives scent molecules off fabric before they can bind, which is the argument made in full in does cold water actually clean clothes.
- Rinse properly but do not over-rinse. Two clean-water rinses is the balance point between residue and scent.
- Store folded and closed. A drawer holds a composition for weeks; an open shelf releases it in days.
- Match the fragrance to the fibre. Citrus Serenade suits linen and summer shirting, Mystic Oasis suits knitwear and outerwear, and Golden Veil suits cashmere and evening pieces. The families behind those choices are explained in the four fragrance families.
When to use a professional instead
Send it out when the garment is structured tailoring, when it carries leather or suede trim, when it is beaded or sequinned, when the wash tub on the label is crossed out, or when it is a viscose or rayon blend with a lining, because viscose loses most of its strength wet. Everything else in a normal wardrobe can be washed at home.
The same method for cotton, denim, performance synthetics, viscose and down, plus seasonal storage for knitwear, is in The Scent Wash Fabric Care Manual, a free 13-page PDF.
Frequently asked questions
Can you machine wash cashmere?
Yes, on a wool or delicate cycle at 20 °C with the spin set to 400 to 600 rpm, in a mesh bag, with the drum no more than half full. Dry flat and reshape. Hand washing is gentler and takes five minutes, so it is worth it for anything expensive.
What temperature should I wash wool at?
20 to 30 degrees Celsius. Above that, the scales on the fibre open and agitation locks them together, which is felting. Felting is permanent, so treat 30 degrees as an absolute ceiling rather than a guideline.
Can you wash silk at home?
Yes, unless the care label crosses out the wash tub. Use cool water and fully dissolved detergent, keep contact under ten minutes, rinse thoroughly, add a tablespoon of white vinegar to the final rinse, press the water out in a towel and dry in the shade. Never wring silk and never dry it in sun.
Does linen shrink?
About 3 to 4 percent on the first wash if it has not been pre-shrunk, and almost nothing afterwards. Washing cold and drying on low or on a line keeps it to the minimum.
Can you tumble dry wool or silk?
No. Heat and tumbling felt wool permanently and dull silk. Both should be dried flat, wool reshaped on a towel and silk out of direct sun. Linen tumbles on low if you remove it while still slightly damp.
How often should you wash a wool jumper?
Every three to five wears, or immediately if it has been sweated through. In between, air it flat overnight. Airing removes most odour, because the smell comes from bacteria on the surface rather than from deep inside the yarn.
Is enzyme detergent safe for wool and silk?
In a normal wash cycle, yes, because the contact time is short and the dilution is high. What damages protein fibres is soaking them in enzyme detergent for hours. Keep wool and silk in detergent for five to ten minutes, then rinse until the water runs clear.
