The best wool wash liquid is enzyme-free, pH-neutral or slightly acidic, and free from bleach and optical brighteners. Many also contain lanolin, the natural oil in sheep's wool, to keep fibres soft. Avoid regular biological detergents, because their protease enzymes break down wool's protein fibres. Use the wool wash on a cool wool cycle or by hand, squeeze rather than wring, and always dry wool flat.
Wool is one of the easiest fibres to care for, as long as you treat it as what it is: a protein, like your own hair. Get the detergent and temperature right and a good jumper lasts for years. It is part of our main guide to fresh, clean laundry in the UK.
What Makes a Good Wool Wash?
| Look for | Why it matters |
|---|---|
| Enzyme-free | Protease enzymes digest protein stains, and wool is made of protein, so they weaken the fibres over time. |
| pH-neutral or slightly acidic | Wool is damaged by alkaline washing, which leaves it harsh and prone to felting. |
| No bleach | Both chlorine and oxygen bleach can damage wool fibres. |
| No optical brighteners | They are designed to make cotton look whiter and can change the natural shade of wool. |
| Lanolin (optional) | Replaces some of the natural oil lost in washing, helping wool stay soft and slightly water-resistant. |
| Low-foaming | Rinses out easily on a gentle wool cycle with little water. |
Wool Wash vs Regular Detergent
| Product | Safe for wool? | Notes |
|---|---|---|
| Biological detergent | No | Contains enzymes that attack protein fibres |
| Non-bio detergent | Sometimes | Enzyme-free, but often alkaline and may contain brighteners |
| "Delicates" detergent | Check the label | Some contain enzymes; look for "suitable for wool and silk" |
| Dedicated wool wash | Yes | Designed for wool, cashmere and silk |
Our comparison of bio vs non-bio detergent explains exactly what each enzyme does and why protease is the problem for wool.
Wool washes on sale in the UK broadly fall into three types: soap-free, pH-neutral liquids; lanolin-enriched washes, popular with knitters; and no-rinse washes for hand washing delicate knits. Any of the three is a far better choice than a standard detergent.
How to Machine Wash Wool
- Check the care label. Only machine wash items labelled as machine washable.
- Turn it inside out to reduce pilling on the outer surface.
- Choose the wool or hand-wash cycle at 30°C or below, with a low spin.
- Add wool wash at the dose on the bottle. Skip fabric conditioner.
- Remove promptly, gently reshape and dry flat.
The Woolmark Company publishes detailed wool care advice, including which garments are designed for machine washing.
How to Hand Wash a Wool Jumper
- Fill a basin with lukewarm water, around 30°C, and dissolve the wool wash.
- Submerge and press. Gently push the jumper under the water and leave it to soak for 5 to 10 minutes. Do not rub or twist.
- Rinse at the same temperature. Sudden changes from warm to cold can cause felting. Skip rinsing if you use a no-rinse wash.
- Squeeze, do not wring. Press out the water, then roll the jumper in a dry towel to remove more.
- Dry flat on a towel or mesh rack, reshaped, away from radiators and direct sunlight.
What Makes Wool Shrink
Heat, Agitation and Temperature Shock
Wool fibres have tiny scales that lock together when they are rubbed while warm and wet, which is called felting. Hot washes, vigorous cycles, wringing, sudden temperature changes and tumble drying all cause it. Once wool has felted it cannot be fully reversed, so prevention is the only reliable fix. Never tumble dry wool unless the label specifically allows it, and never dry it on a radiator.
Wash Wool Less Often
Wool naturally resists odours and does not need washing after every wear. Between washes, hang jumpers outside or in a well-aired room for a few hours, spot clean small marks, and use steam to relax creases and freshen the fibres. Less washing means less wear, and your knitwear keeps its shape for longer.
Our Pick for Wool Care Between Washes
Mini Portable Handheld Garment Steamer
A quick pass of steam relaxes creases in jumpers, coats and scarves and freshens wool between washes, without the heat and pressure of an iron. Hold it a short distance from the fabric and let the garment air before wearing.
View ProductQuick Summary
- Choose an enzyme-free, pH-neutral wool wash without bleach or brighteners.
- Never use biological detergent on wool or silk.
- Wash at 30°C or below on a wool cycle, or by hand.
- Squeeze, roll in a towel and dry flat.
- Heat, agitation and temperature shock cause shrinking.
- Air and steam wool between washes so it lasts longer.
Frequently Asked Questions
Can I use normal detergent on wool?
It is best not to. Biological detergents contain enzymes that damage wool, and many standard detergents are too alkaline. A dedicated wool wash is gentler and keeps knitwear soft.
What temperature should wool be washed at?
30°C or below, on a wool or hand-wash cycle, unless the care label says otherwise. Keep wash and rinse water at the same temperature.
Can you put wool in the tumble dryer?
Only if the care label specifically says it is tumble dryer safe. Otherwise, heat and tumbling can shrink and felt the fibres. Dry wool flat instead.
Can a shrunken wool jumper be fixed?
Sometimes a little. Soaking it in lukewarm water with a gentle hair conditioner and carefully easing it back into shape can recover some size, but fully felted wool cannot be restored.
Is wool wash the same as a delicates detergent?
Not always. Some delicates detergents contain enzymes. Check that the label says enzyme-free or suitable for wool and silk.
How often should I wash a wool jumper?
Only every few wears, or when it is visibly dirty or starts to smell. Airing it between wears is usually enough.
Sources: The Woolmark Company, Wool care; British Wool; retailer wool wash product information.