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Few things in a wardrobe are as comforting as a proper wool jumper, and few things are as nerve-wracking to clean. One wrong turn in the machine and a favourite knit can come out small enough for a child. The reassuring news is that wool is far more forgiving than its reputation suggests – it simply asks for cool water, a gentle touch and a bit of patience while it dries. Get those three things right and your jumpers will stay soft, shapely and wearable for many winters to come.

Why Wool Needs Different Treatment

Look at a wool fibre under a microscope and you will see overlapping scales, a little like roof tiles. Warm water and agitation make those scales lift and lock together, which is exactly what happens during felting. Once the fibres have matted, no amount of coaxing will undo it. Heat is the other enemy: hot water and hot radiators encourage shrinkage that cannot be reversed.

Detergent matters just as much. Most biological washing powders are alkaline and contain enzymes designed to break down proteins – and wool is a protein fibre. Over time they strip the natural lanolin, leaving knitwear brittle, dull and prone to pilling. A pH-neutral liquid made for wool or delicates is the safest choice, and fabric conditioner should be left out entirely, as it coats the fibres and reduces their natural breathability.

Start with the Label and Any Stains

Before anything touches water, check the care label. A tub symbol with a hand inside means hand wash only. A tub with a number tells you the maximum temperature, and a tub with a cross means dry clean. A circle in a square means tumble drying is permitted, but for wool it is best ignored.

Deal with marks before washing, because a stain that goes through a cycle can set permanently.

• Blot – never rub – with a clean cloth and cool water.
• For greasy marks, apply a small amount of wool-safe detergent and leave for ten minutes.
• For odours or light soiling, a simple airing outdoors in the shade may be all that is needed.
• Never use chlorine bleach or oxygen-based stain removers on wool.

Machine Washing on a Wool Cycle

Many modern machines handle wool beautifully, provided you keep the cycle short and the spin slow. Turn the jumper inside out, fasten any buttons, and pop delicate or heavily embellished knits into a mesh laundry bag. Wash with similar colours and avoid overloading the drum, as cramming reduces the cushioning that protects the fibres.

• Select the wool or hand-wash programme, ideally at 30°C or cooler.
• Keep the spin speed low – around 400 to 600 revolutions per minute.
• Use a liquid detergent formulated for wool, and measure it rather than guessing.
• Skip the fabric conditioner and any added bleach or whitening agents.

Wash wool far less often than you think necessary. Wool resists odour naturally and benefits from being aired between wears, so a jumper worn over a shirt may only need a wash every few weeks.

Hand Washing: Slow, Cool and Gentle

Hand washing gives you the most control. Fill a basin or clean sink with lukewarm water – roughly 30°C, or comfortable to the touch – and add a small amount of wool detergent. A little mild baby shampoo works well as a back-up.

• Submerge the jumper and press it down gently so the water soaks through. Do not scrub or rub the fabric against itself.
• Let it soak for around ten minutes.
• Rinse in water of the same temperature, as a sudden change can cause the fibres to contract.
• Never wring, twist or lift the jumper by one shoulder while it is heavy with water.

To move it safely, scoop the jumper up with both hands and support the whole garment, or lift it in a colander or bowl.

Drying Flat to Keep the Shape

Drying is where most jumpers lose their shape rather than their size. Lay a clean, dry bath towel on a flat surface, place the jumper on top, then roll the towel up with the jumper inside and press down firmly. The towel will absorb a surprising amount of water without any wringing.

• Transfer the damp jumper to a fresh dry towel or a mesh drying rack and lay it flat.
• Reshape while it is still damp: ease out the cuffs, smooth the collar and straighten the side seams.
• Dry away from radiators, direct sunlight and hot pipes, which can cause shrinkage and fading.
• Turn the jumper over after a day, as thicker knits can take 24 to 48 hours to dry completely.
• Never hang a wet jumper on a line or hanger – the weight will stretch the shoulders and hem.

Everyday Care and Storage

A little routine care between washes keeps knitwear looking new. Fold jumpers rather than hanging them, as hangers distort the shoulders over time. Air them outdoors in the shade for an hour or two after wearing, and use a knitwear comb or sweater stone to lift bobbles gently rather than pulling at pills with your fingers.

Before putting anything away for the season, make sure it is genuinely clean – moths are drawn to food stains and perspiration. Store knitwear in a breathable cotton bag or a clean airtight box with cedar blocks or dried lavender, and give the drawer a quick air every few months. Handled this way, a good wool jumper will reward you with years of wear, and washing day will stop being something to dread.