Washing Raw Fleece Without Felting the Fibre

Why Cool Water Matters More Than Strong Soap

Raw fleece arrives from the sheep carrying a generous coating of lanolin, dust, vegetable matter and the occasional surprise. The goal is to remove all of that without turning your beautiful, crimpy locks into a solid mat of felt. Felting is a simple physical process: wool fibres have microscopic scales that lift when they are wet, warm and alkaline. If those scales are then rubbed against one another, they lock together irreversibly. Heat accelerates the process; agitation seals the deal. So the golden rule is simple — use the coolest water that will still dissolve the grease, keep your hands out of the equation as much as possible, and never, ever rub.

Cool water — around 20 to 30°C, or no warmer than a baby's bath — slows the opening of those scales. A gentle detergent lifts the lanolin away without stripping the fibre. Patience does the rest. You are not scrubbing; you are soaking. Think of it as a long, lazy bath rather than a wash-day workout.

The Kit You'll Need (and What to Avoid)

Before you start, gather everything so you are not dashing about with wet hands. You will need:

• Two or three large tubs, buckets or a clean sink — ideally one for washing and two for rinsing.
• Mesh laundry bags or nets. These let water and soap through but keep the fleece contained, so you can lift it without squeezing.
• A gentle, non-biological detergent. Washing-up liquid works well for small amounts; a dedicated wool scour is even better. Avoid anything with enzymes, bleach or fabric conditioner.
• A thermometer — a cheap kitchen one is fine. You will use it to match temperatures exactly.
• Rubber gloves if you dislike the greasy feel.
• A drying rack, old towels and a shady spot with good airflow.

What to avoid: hot water, biological washing powder, soda crystals, ammonia, and any urge to wring, rub or agitate. A top-loading washing machine on any setting other than a delicate spin cycle is a felt-making machine.

The Soak-and-Rinse Method, Step by Step

Work in small batches. A handful of fleece per mesh bag is plenty. Fill your first tub with cool water and add a good squirt of detergent — roughly a tablespoon per five litres. Stir the water first, then lower the bagged fleece in gently. Do not pour water onto the fleece.

Let it soak for 20 to 30 minutes. The water will turn cloudy and yellow as the lanolin and dirt release. Now, lift the bag straight out and let it drain. Do not squeeze. Empty the tub and refill with clean water at exactly the same temperature. Lower the bag back in and soak again for another 15 to 20 minutes. Repeat this wash-rinse cycle two or three times, or until the water stays clear.

For the final rinse, add a teaspoon of white vinegar to the water if you like — it helps remove soap residue and restores a slightly acidic pH, which keeps the scales flat. Again, match the temperature exactly. Lift, drain, and you are ready to dry.

Tackling Greasy or Heavily Soiled Fleeces

Some fleeces — particularly from breeds like Romney or Lincoln — carry so much lanolin that a single wash barely makes a dent. Resist the temptation to turn up the heat. Instead, extend the soak time to 45 minutes and use slightly more detergent. You may need four or five wash cycles. That is normal.

For very dirty fleeces, skirt the fleece first. Spread it out and remove the worst of the daggy, matted edges, the belly wool and any vegetation. This reduces the dirt load before the fleece ever hits the water. If the fleece is heavily contaminated with vegetable matter, pick out what you can by hand — water will only make it cling more stubbornly.

If you encounter a particularly waxy fleece, a second wash with fresh detergent at the same cool temperature will do more good than any amount of hot water. Lanolin is stubborn, but it does surrender to repeated cool baths.

Drying, Storing and Keeping the Crimp Intact

After the final rinse, lift the mesh bag and let it drain until it stops dripping. You can spin the bag in a washing machine on a slow spin cycle for a minute or two — the mesh protects the fibre from agitation. Alternatively, lay the fleece on a clean towel, roll the towel up and press down firmly to blot out excess water. Never twist or wring.

Spread the fleece loosely on a drying rack in a shaded, well-ventilated spot. Do not use direct heat, radiators or a tumble dryer. Turn the locks gently once or twice a day. Drying usually takes 24 to 48 hours, depending on humidity. When completely dry, store the fleece in a breathable cotton bag or a cardboard box. Add a few drops of lavender or cedar oil to discourage moths, but never seal damp fleece in plastic.

Handled this way, your fleece will retain its staple length and its springy crimp. The locks will separate easily when you card or comb them, and the spinning will be a joy. Cool water, gentle soap and patience — that is the whole secret. Your hands will thank you, and so will your yarn.