To wash a wool blanket, soak it in cold or lukewarm water with a little wool-safe detergent for 10 to 15 minutes, press it gently (no rubbing or wringing), rinse in water of the same temperature, and dry it flat in the shade. If the label allows machine washing, use the wool cycle with cold water and a low spin. Never use hot water or a tumble dryer.
My Own Wool Blanket Mistake
A few winters ago I washed a thick wool blanket the way I wash everything else: warm water, normal cycle, regular powder. It came out about a size smaller and stiff as cardboard. I had turned a soft, expensive blanket into something that barely covered my knees.
That mistake pushed me to actually learn how wool works, and I’ve washed wool blankets the right way ever since. Here is everything I wish I’d known before that first wash.
Why Wool Blankets Shrink in the First Place
Wool fibres have tiny scales on the surface. When you combine heat, water and rubbing, those scales hook onto each other and the fibres tighten together. That is called felting, and it’s why wool shrinks.
So the whole job comes down to avoiding three things: heat, friction and sudden temperature changes.
Do You Even Need to Wash It?
Often, no. Wool doesn’t hold odour the way cotton does, and it’s naturally resistant to dust. Woolmark says wool blankets should be washed sparingly, with some guidelines suggesting about once every three months.
What I do between washes:
- Hang the blanket outside in the shade on a dry day
- Shake it well to remove dust
- Brush it lightly with a soft brush, in the direction of the fibres
Example: My winter blanket sits on the bed from November to February. I air it every two weeks and wash it once at the start of the season and once at the end. That’s it.
What You’ll Need
- Large tub or clean bathtub
- Mild wool detergent (or a gentle, enzyme-free liquid)
- 2 to 3 large clean towels
- A drying rack or a flat clean surface
Avoid bleach, fabric softener and enzyme detergents, because they can damage wool fibres.
Step-by-Step: How to Hand Wash a Wool Blanket
1. Check the care label. If it says “dry clean only,” follow it. If there’s no label, hand washing is the safest choice.
2. Shake and brush it. Remove loose dust and hair first.
3. Fill the tub with cold or lukewarm water. Aim for roughly 30°C (86°F) at most. If the water feels hot to your hand, it’s too hot for wool.
4. Add a small amount of detergent. A capful is enough. Mix it into the water before the blanket goes in. More soap doesn’t mean cleaner; it just takes longer to rinse and leaves wool feeling stiff.
5. Soak and press. Push the blanket under until it’s fully wet, then leave it for 10 to 15 minutes. Press gently a few times like squeezing a sponge. Don’t scrub or twist.
6. Rinse. Drain the tub, refill with clean water at the same temperature, and press gently until the suds are gone. A big temperature jump between wash and rinse can shock the fibres, so keep it steady.
7. Remove the water. Lift the blanket with both arms because wet wool is heavy and stretches easily. Lay it on a large towel, roll it up, and press. Repeat with a dry towel if it’s still dripping.
How to Machine Wash a Wool Blanket
Only try this if the label says it’s machine washable.
- Use a big-capacity machine
- Choose the wool or delicate cycle
- Use cold water
- Use wool-specific detergent only
- Set the spin to low
This matches Woolmark’s advice: use the gentle wool cycle, cold water and a wool-specific detergent. Wash it alone, not with jeans, towels or anything with zips.
Example: I once threw a wool blanket in with a hoodie that had a metal zip. The blanket came out with small snags. Since then, it always goes in alone.
How to Dry a Wool Blanket
This is where most damage happens.
- Lay it flat on a clean towel or drying rack
- Keep it away from direct sun and heaters
- Reshape it gently to its original size
- Flip it every few hours
- Expect 24 to 48 hours of drying time
If you use a clothesline, spread the blanket over the line so its weight is balanced and not hanging from one edge. Don’t use the tumble dryer, because heat and tumbling can ruin the softness and shape of wool.
Once dry, give it a light shake and a soft brush to bring back the fluff.
How to Remove Stains From a Wool Blanket
Spot-clean instead of washing the whole blanket when you can.
- Tea or coffee: Blot with a clean cloth, then dab with cold water and a tiny drop of wool detergent
- Food spills: Scrape off any solids first, then blot
- Smell: Air it outside for a few hours before deciding to wash
Example: My cousin spilled chai on my blanket last winter. I blotted it right away, dabbed it with cold water and a little detergent, and it was gone in five minutes. No full wash needed.
Don’t rub, and never use bleach on wool.
What If Your Wool Blanket Already Shrank?
Don’t throw it away yet. Mild shrinkage can often be improved.
Fill a tub with lukewarm water and add a bit of hair conditioner or baby shampoo. Soak the blanket for 15 to 30 minutes, then gently squeeze out the water, lay it on a towel and stretch it carefully in all directions. Mountain Warehouse recommends this method for merino wool. For a step-by-step guide aimed at blankets specifically, Amerisleep explains how to assess the damage first.
Be realistic, though. This helps with light shrinking, but fully felted wool usually can’t be brought back.
7 Common Mistakes to Avoid
- Using hot water
- Wringing or twisting the blanket
- Using fabric softener or bleach
- Choosing a normal cycle instead of the wool cycle
- Hanging the wet blanket by one corner
- Using the dryer
- Storing it before it’s fully dry
How to Store a Wool Blanket
Make sure it’s completely dry and clean, because stains and body oils attract moths. Fold it loosely and keep it in a breathable cotton bag or a box with cedar blocks or lavender sachets. Skip plastic bags, since they trap moisture and cause mildew. If you live somewhere humid, take it out and air it occasionally.
Final Thoughts
Washing a wool blanket isn’t complicated: cold water, gentle handling, mild detergent and flat drying. Wash it only when you really need to, air it often, and it can last for many years. I learned that the hard way, and hopefully this guide saves you from doing the same.
FAQs
1. Can I wash a wool blanket in the washing machine?
Yes, but only if the care label allows it. Use the wool cycle, cold water, wool detergent and a low spin.
2. How often should I wash a wool blanket?
Only when needed. Some guidelines suggest about every three months, and regular airing helps you wash it less.
3. Can I put a wool blanket in the dryer?
No. Heat and tumbling cause shrinking and felting. Dry it flat.
4. What water temperature is safe for wool?
Cold to lukewarm, about 30°C (86°F) or lower.
5. Can I use regular detergent?
It’s better not to. Harsh or enzyme-based detergents can weaken wool. Use a mild wool-safe one.
6. How do I stop a wool blanket from shrinking?
Use cold water, don’t rub or wring, avoid heat, and dry it flat.
7. Can I fix a shrunken wool blanket?
Sometimes. Soak it in lukewarm water with hair conditioner, then gently stretch it. It works on light shrinkage, not on fully felted wool.
8. How do I get the smell out of a wool blanket?
Air it outdoors in the shade for a few hours. If the smell stays, hand wash it.
