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It's a Saturday in April. The sun is finally shining properly, you open your wardrobe for a light jacket and spot that stack of sweaters still sitting there. The grey wool sweater you wore three times a week, the knitted vest with a coffee stain on the sleeve, the jumper that's been at the bottom since February. You want to store them away, but you also want to find them in October without holes, musty smells, or stretched-out shoulders.
You can make this work with a fixed sequence: first assess, then wash, dry properly, and finally store in a breathable, moth-proof way. Below is what you do at each step and why.
Step 1: Determine Which Sweaters Really Need Washing
During the season, you don't need to wash sweaters after every wear. Fashion Musthaves recommends washing a sweater only when it's visibly dirty, has stains, or no longer smells fresh. If you wore it briefly over a top, airing it out is often enough. Washing too frequently causes extra wear, loss of shape, and pilling.
For a long summer break, things are different. Aran Sweater Market advises giving wool sweaters a thorough wash before long-term storage, even if they look clean. Invisible traces of skin oils, sweat, and food particles attract pests, and stains and odors have months to set in.
Lay all your sweaters on your bed and sort them this way:
- Wool, merino, and cashmere: wash before storage, using a wool program or by hand.
- Cotton sweaters and synthetic knits: wash if worn, on a delicate cycle.
- Sweaters with a dry-cleaning label: take to the dry cleaner, or don't risk the machine.
- Sweaters you never wear: don't wash and store—donate, sell, or take to textile recycling.
That last pile is a good reality check for your wardrobe. If a sweater went unworn all winter, ask yourself honestly whether you'll actually wear it next year.
Step 2: Read the Care Label and Prepare the Sweater
The care label always takes priority over general tips. Fashion Musthaves recommends always checking the label first. Wool brands and detergent manufacturers give different advice, so your specific sweater's label is the most reliable source.
Then turn the sweater inside out. Both Fashion Musthaves and Wasparfum.nl mention this as the first step: the outside rubs less against the drum and other clothes, reducing lint and pilling.
Treat stains beforehand, like that coffee mark on the sleeve. Gently dab it with a little wool detergent and lukewarm water—don't rub hard.
Step 3: Wash with Mild Detergent and a Short Cycle
Detergent
Wash-ME recommends mild detergent for delicate fabrics like wool. For wool, merino, and cashmere, choose a specialized wool detergent.
Skip fabric softener. According to Wash-ME, it's not always necessary and can reduce the breathability of some fabrics. With a wool sweater, that's exactly the quality you bought it for.
Program
Fashion Musthaves advises using a shorter or gentler wash cycle. Use your machine's wool or hand-wash program and stick to the temperature on the label.
Hand Washing
Unsure about your machine or washing your most expensive sweater? Wash by hand instead. Fill a basin with lukewarm water and a splash of wool detergent, let the sweater soak briefly, and gently move it back and forth. Rinse with lukewarm water. Press the water out, but don't wring.
Step 4: Let the Sweater Dry Completely Flat
This is where most people go wrong. A wet wool sweater is heavy, and hanging it on a hanger or clothesline stretches the fibers. Aran Sweater Market warns explicitly about this: if you hang a sweater while wet, the wool fibers will stretch out.
Here's how to do it:
- Lay the sweater on a dry towel and roll them together. Press the roll so the towel absorbs most of the water.
- Unroll and lay the sweater flat on a drying rack or a fresh dry towel.
- Reshape it with your hands: sleeves straight, shoulders at width, neckline not stretched.
- Flip it over after a day so the underside dries properly.
Don't place the rack in direct sunlight or on a heater. A regular room with some ventilation is fine. In the Netherlands, with a damp spring, it may take longer than expected. Take your time, because a sweater stored while still slightly damp will smell musty in October and may develop mold.
Before storing, check the thickest areas: the armpits, neckline, and seams. Feel whether the fabric is still damp or moist. If in doubt, leave the sweater out for another day.
Step 5: Fold, Don't Hang
For summer storage, fold your sweaters. Wash-ME gives this advice to prevent stretching: a sweater hanging on a hanger for months gets bumps on the shoulders and sags in length.
At Joe Merino, you'll read something that seems contradictory at first: hang your sweater on a hook if you wear it regularly, because fresh air is good for it and makes moths less likely. That advice is about airing a sweater between wears. Hanging a sweater for months is a different situation. During the season, you can let a frequently-worn sweater air on a hook. For long-term storage, choose folding.
Fold like this:
- Lay the sweater front-side down.
- Fold the sleeves toward the center of the back.
- Fold the sweater in half or thirds lengthwise, depending on your storage space depth.
- Place the heaviest sweaters on the bottom and thin merino and cotton sweaters on top.
Step 6: Choose Breathable Storage and Keep Moths Away
No Plastic
Wash-ME recommends using breathable storage bags instead of plastic to prevent mold and odors. Sealed plastic traps residual moisture. Choose a cotton storage bag, fabric box, or cardboard box lined with a cotton cloth.
Natural Moth Prevention
Moths are the biggest threat to wool in summer. Both Wash-ME and Aran Sweater Market mention cedarwood and lavender as natural deterrents. Joe Merino adds a simple home remedy: place a bar of soap between your sweaters, because moths dislike strong scents. Such scent products offer no guarantee. Storing clean items, as in Step 1, and checking regularly remain important. For more information about moths, Joe Merino refers to Milieu Centraal's website.
According to Joe Merino, moths also like piles in a dark closet. That's a good reason not to forget your stored sweaters all season. Halfway through summer, open the storage, shake out the sweaters, and look for holes or fuzzy threads. This way you'll catch a problem early.
The Location
Choose a dry spot, such as a closet in your home. Under the bed also works well, as long as there's a breathable box and you don't vacuum with the box as a bumper.
What You'll Have in October
When the first cold, wet morning of autumn arrives and you need to rush to the train with the wind in your face, you won't want to wash a sweater first. With this method, you'll pull a clean, fresh sweater in perfect shape from the box. Plus, you'll immediately see what you have, helping you decide whether you really need something new this fall or if that grey wool sweater will make it through another season.
Your First Step
Tonight, lay all your sweaters on your bed and make the four piles from Step 1: wool to wash, others to wash, dry cleaning, and donate. Then start with one wool sweater on a wool cycle with mild wool detergent and let it dry flat. If it dries without shrinking or stretching, you'll know the method works with your machine and can get through the rest of the pile in a weekend.