How to Wash a Military Wool Blanket (Without Shrinking It)

A military wool blanket can last for decades, but only if you wash it correctly. Hot water, heavy agitation and high heat are what ruin wool. Done right, washing is safe and often brings an old blanket back to life.

Here's how to clean one, whether it's a vintage Canadian military wool blanket or any other surplus find.

Can You Wash a Military Wool Blanket?

Yes, in most cases. Many surplus wool blankets can be machine washed gently or hand washed. The risk is shrinking and felting, which happens when wool fibers are exposed to heat, agitation and sudden temperature changes. Wool that has felted becomes stiff, smaller and permanently dense.

Check for a care label first. Many old military blankets don't have one, so when in doubt, hand wash. Also test a small hidden corner for color bleeding, especially on dark or dyed blankets.

What You'll Need

• A wool-safe or mild detergent (no bleach, no fabric softener)
• A clean tub or a front-loading washer
• Clean towels for drying
• A flat surface or drying rack

Step 1: Shake It Out and Inspect

Take the blanket outside and shake it vigorously to remove dust and debris. Look over the whole blanket for holes, moth damage, stains and loose edges. Mend small holes before washing so they don't grow.

Spot-treat stains by dabbing a little mild detergent on the area and letting it sit for a few minutes. Avoid harsh stain removers.

Step 2: Choose Your Washing Method

Hand Washing (Safest)

• Fill a tub with cold water and add a small amount of wool-safe detergent.
• Submerge the blanket and press it gently. Don't scrub or wring.
• Soak for 15 to 30 minutes.
• Drain, then rinse with clean cold water until the soap is gone.

Machine Washing (Gentle Only)

• Use a front-loader, or a top-loader without a central agitator.
• Choose the delicate or wool cycle with cold water.
• Use a small amount of mild detergent.
• Wash the blanket alone, with enough room to move freely.

Heavy, thick blankets absorb a lot of water, so don't overload your machine. If the blanket is very large, a laundromat's large front-loader is a good option.

Step 3: Remove Water Without Wringing

Never twist or wring wool. Wet wool is heavy and fragile. Press out water gently, or run a short low-speed spin if your machine allows it. Then roll the blanket in a clean towel to absorb extra moisture.

Step 4: Dry It Properly

Drying is where most blankets get ruined.

• Air dry flat (best): lay it on a clean towel or drying rack, away from direct sun and heat. Smooth it back to its original shape. Flip it periodically. Drying can take a day or two, depending on thickness and humidity.
• Avoid direct sunlight: it can fade dyes and weaken fibers.
• If you must use a dryer: use the lowest heat or air-only setting and pull the blanket out while it's still slightly damp, then finish drying flat. Dryer balls help keep the wool fluffy.

Make sure it is completely dry before storing. Damp wool can mildew.

How to Get Rid of a Musty Smell

Surplus blankets sometimes smell of storage. Try these steps:

• Air it outdoors in shade and a breeze for a day or two.
• Wash gently as above.
• For stubborn odor, a short soak in cool water with a little white vinegar can help. Rinse well.

If the odor is chemical rather than musty, wash it twice and air it out fully before using it as bedding.

What to Avoid

• Hot water
• Bleach or chlorine products
• Fabric softener, which coats fibers
• Wringing or twisting
• Hanging a wet blanket on a line (the weight stretches it)
• Storing it damp or in a sealed plastic bag

How Often Should You Wash It?

Less often than you think. Wool naturally resists odor, so airing a blanket out regularly is often enough. Wash it when it's visibly dirty, smells, or after long-term storage. Over-washing wears fibers faster.

Store It for the Long Term

Fold it clean and dry, and store it in a breathable cotton bag or wrapped in a clean sheet in a cool, dry place. Avoid plastic bins that trap moisture. Add cedar blocks or lavender to discourage moths, and check the blanket a few times a year.

Why Wool Is Worth the Effort

Wool insulates even when damp and is naturally harder to ignite than many synthetic fabrics, though it isn't flameproof. That's why wool blankets have been standard issue for generations. They work as bedding, a layer over a sleeping bag, ground cover or an emergency warm-up wrap.

Browse our full selection of military blankets, and pair a wool blanket with a military sleeping bag or your cold weather gear for serious warmth.