Hand washing is the safest method for most knitted sweaters
Hand washing in cool water is the gentlest way to clean a knitted sweater and the method most likely to keep it looking new. Machine washing, even on a delicate cycle, can stretch, pill, or felt wool and other natural fibres. Hand washing takes about ten minutes of active work and costs almost nothing — you need only cool water, a mild detergent, and a clean towel.
The basic process is straightforward: soak the sweater in soapy water for a few minutes, gently squeeze the water through the fabric without wringing or twisting, rinse in clean cool water until the soap is gone, then lay it flat to dry. The key is treating the wet sweater as fragile — it loses strength when wet and can stretch or tear if you pull on it.
Key Takeaways
- Use cool water and a mild detergent designed for wool or delicates; hot water can shrink or felt natural fibres.
- Soak the sweater for three to five minutes, then gently squeeze soapy water through it without wringing, twisting, or agitating.
- Rinse in cool water two or three times until no soap remains, then gently squeeze out excess water without wringing.
- Lay the sweater flat on a clean towel to dry; never hang it wet, as the weight of the water will stretch it out of shape.
- Check the care label first — some sweaters are machine-washable on a gentle cycle, and some fibres have specific requirements.
What detergent and water temperature to use
Use cool water — between 60 and 70 degrees Fahrenheit (15 to 21 degrees Celsius) — for washing and rinsing. Hot water can cause wool, cashmere, and other animal fibres to shrink or felt (mat together permanently). Cold water works just as well for removing dirt and sweat and is safer for the sweater.
Choose a mild detergent made for wool or delicates. Woolite, The Laundress Delicate Wash, and Dreft are common brands, but any detergent labelled for wool or hand-washing will work. Regular laundry detergent is too harsh and can damage the fibres or leave residue. Use only about one teaspoon per gallon of water — you need much less than you would for a machine load, and excess soap is harder to rinse out.
If you do not have wool-specific detergent, a small amount of gentle dish soap (like plain Dawn) works in a pinch, though it can be harder to rinse completely. Avoid fabric softener, which coats the fibres and dulls the sweater's appearance over time.
The step-by-step washing process
Fill a sink or basin with cool water and add about one teaspoon of mild detergent. Stir until the soap is dissolved. Submerge the sweater and let it soak for three to five minutes — this gives the soap time to loosen dirt and oils without you having to agitate the fabric.
After soaking, gently squeeze the soapy water through the sweater by pressing it with your hands. Work from the top down, moving along the sleeves and body. Do not wring, twist, or rub the fabric — these actions can stretch it or cause pilling. If the sweater is visibly dirty or stained, you can gently rub the affected area between your fingers, but avoid scrubbing.
Drain the sink and rinse the sweater under cool running water or by refilling the sink with clean cool water and soaking again. Squeeze gently to remove the soapy water. Repeat the rinse two or three times until the water runs clear and you cannot smell soap — leftover detergent can stiffen the fibres or cause itching.
How to remove excess water without stretching
Once the sweater is rinsed, you need to remove as much water as possible without wringing it. Gently squeeze the sweater in your hands, pressing the water out without twisting or pulling. Work section by section — sleeves, front, back, sides — and be patient. This step takes a minute or two but prevents the sweater from staying wet for days.
A second method is to lay the sweater flat on a clean, dry towel, roll the towel and sweater together like a log, and gently press down on the roll. The towel absorbs water without you having to handle the wet sweater. Unroll it carefully and move the sweater to a fresh dry towel for the next step.
Drying the sweater flat to preserve its shape
Lay the sweater flat on a clean, dry towel in a well-ventilated area away from direct sunlight or heat. Arrange it so the sleeves lie flat and the body is not bunched or folded. If the towel becomes damp, move the sweater to a fresh dry towel. The sweater will dry in 24 to 48 hours depending on the fibre, thickness, and humidity in your home.
Never hang a wet knitted sweater — the weight of the water will stretch it permanently, especially at the shoulders and neckline. Do not use a clothes dryer, even on low heat, as the heat can shrink or damage the fibres. Do not place it near a radiator, heater, or direct sunlight, which can also cause shrinkage or fading.
Once the sweater is completely dry, you can fold it and store it. If you notice it has stretched slightly while wet, you can gently reshape it while it dries by adjusting the sleeves or body as needed.
When to check the care label first
Before you wash any sweater, read the care label sewn into the side seam or neckline. It will tell you the fibre content (wool, cotton, acrylic, cashmere, etc.) and washing instructions. Some sweaters are labelled "dry clean only" — these should go to a professional cleaner. Others say "machine wash gentle" or "hand wash cold," which tells you the safest method.
Acrylic and cotton sweaters are more forgiving than wool or cashmere and can often tolerate machine washing on a delicate cycle with cool water. Wool and cashmere are more delicate and almost always benefit from hand washing. Blended fibres (wool and acrylic, for example) should be treated according to the most delicate fibre in the blend.
If the label is missing or illegible, treat the sweater as if it were wool — hand washing in cool water is the safest default for any natural fibre.
Dealing with stains before washing
If your sweater has a visible stain, treat it before you wash the whole garment. Blot the stain gently with a clean cloth to remove any excess liquid or debris — do not rub, which can push the stain deeper into the fibres. For grease stains, sprinkle a small amount of talcum powder or cornstarch on the spot and let it sit for 15 minutes to absorb the oil, then brush it away gently.
For other stains, mix a small amount of mild detergent with cool water to make a paste, explore it to the stain, and let it sit for five to ten minutes. Gently rub the area between your fingers or with a soft cloth, then rinse with cool water. If the stain remains after washing the whole sweater, you can repeat this process, but avoid scrubbing hard, which can damage the fibres.
Some stains (wine, blood, ink) may need a stain remover designed for delicate fabrics. Test any product on a hidden area of the sweater first to make sure it does not discolour the yarn.
Frequently Asked Questions
Can I machine wash my sweater on a delicate cycle?
Check the care label first. If it says "machine wash gentle" or "machine wash cold," a delicate cycle is safe. Use cool water, a mild detergent, and a mesh laundry bag to protect the sweater from snagging. If the label says "hand wash only" or does not mention machine washing, hand washing is safer.
What should I do if my sweater shrinks after washing?
Wet wool can sometimes be gently stretched back to its original shape. While the sweater is still damp, lay it flat and carefully pull it to the correct size, then let it dry. If it has already dried, you can soak it again in cool water with a small amount of hair conditioner or wool relaxer, then gently stretch and dry it flat. Severe shrinkage may be permanent.
How often should I wash a knitted sweater?
Wash a sweater only when it is visibly dirty or smells stale — most sweaters can go several wears between washes. Frequent washing wears out the fibres faster. Between washes, hang the sweater in fresh air or lay it flat to air out, and use a lint roller or soft brush to remove pilling or surface dirt.
Why is my sweater pilling after I washed it?
Pilling happens when short fibres work loose from the yarn and ball up on the surface — it is usually a sign of wear, not washing damage. You can remove pills with a lint roller, a sweater comb, or a fabric shaver designed for this purpose. Washing gently and drying flat reduces pilling, but it cannot prevent it entirely on lower-quality yarns.
Can I use fabric softener on a wool sweater?
No — fabric softener coats the fibres and makes them feel stiff or waxy over time, and it can trap odours. If your sweater feels scratchy, use a small amount of hair conditioner in the final rinse instead, which softens the fibres without the coating.