6 Best Fiber Degreasers for Scouring Raw Fleece

That beautiful, greasy fleece straight off the sheep is a bundle of pure potential, smelling of lanolin, sunshine, and the pasture it came from. But before you can turn that raw fiber into lofty, spinnable clouds of wool, you have to get it clean. Proper scouring is the non-negotiable first step that sets the stage for everything that follows, from dyeing to spinning.

Disclosure: As an Amazon Associate, this site earns from qualifying purchases. Thank you!

Why Proper Scouring is Key for Spinners

Scouring is more than just washing; it’s the process of removing the grease (lanolin), dirt, and vegetable matter from raw fleece. An improperly scoured fleece will fight you at every stage. Lanolin, a waxy substance that protects the sheep’s skin, will gum up your hand carders or drum carder, resist dye, and leave your finished yarn feeling sticky and heavy.

Think of it as preparing a canvas for painting. You wouldn’t start with a dirty, oily surface, and the same principle applies to fiber. A thoroughly scoured fleece opens the fibers, allowing them to draft smoothly and spin into a balanced, consistent yarn. Skipping this step or doing it halfway is a classic beginner’s mistake that wastes time, effort, and the beautiful fiber you worked so hard to raise or acquire. Proper scouring honors the fleece and your time.

Unicorn Power Scour: The Spinner’s Choice

If you’re looking for a product designed from the ground up for washing wool, Unicorn Power Scour is the one. It’s a biodegradable, pH-neutral detergent specifically formulated to break down heavy grease without being harsh on the delicate protein structure of the wool. This means you get exceptionally clean, fluffy wool that retains its natural softness and spring.

Power Scour is highly concentrated, so a little goes a long way, making it more economical than it first appears. It’s particularly effective in hard water and rinses out completely, which is a major advantage for preventing that dreaded sticky feeling in your final yarn. For the serious spinner who processes multiple fleeces a year and wants consistent, professional-grade results without any guesswork, this is the best investment you can make for your fiber prep station.

Orvus Paste: A Versatile, Concentrated Classic

Many small farms already have a tub of Orvus Paste in the barn for washing livestock, and it doubles as a highly effective, no-frills fleece scour. This concentrated sodium lauryl sulfate paste is a powerful degreaser that cuts through even the heaviest lanolin. You only need a small amount dissolved in hot water to create a potent scouring solution.

The key thing to know about Orvus is that it’s an anionic surfactant with a higher pH than specialty wool scours. While very effective, this alkalinity can be slightly harsh on fine fibers if you’re not careful. It’s crucial to rinse thoroughly and consider a final vinegar rinse to restore the wool’s natural acidic pH. If you value multi-purpose supplies and are scouring durable, medium-to-coarse wools, Orvus is an unbeatable and economical workhorse.

Kookaburra Wool Scour: Gentle on Fine Fibers

When you’re working with incredibly fine and delicate fibers like Merino, Cormo, alpaca, or mohair, gentleness is the top priority. Kookaburra Wool Scour is formulated with this in mind, using plant-based ingredients and essential oils like tea tree and lanolin to clean effectively while conditioning the fibers. It’s designed to preserve the natural luster and buttery-soft handle of premium fleeces.

This product is less aggressive than other degreasers, making it the perfect choice for fleeces with lower grease content or for fibers that can easily be damaged by high pH cleaners. While it might require a second wash for a particularly dirty fleece, the tradeoff is a superior end product with unparalleled softness. If you’ve invested in or raised animals specifically for their luxurious, high-value fiber, Kookaburra is the specialized tool you need to protect that investment.

Dawn Dish Soap: The Accessible Budget Option

Let’s be practical: sometimes you need to scour a fleece right now and don’t have a specialty product on hand. In a pinch, the original blue Dawn dish soap can get the job done. It is a formidable degreaser, designed to cut through kitchen grease, and it will absolutely strip the lanolin from a raw fleece.

However, its effectiveness is also its biggest drawback. Dawn can be very harsh on wool, stripping not just the grease but also some of the natural life and spring from the fiber, potentially leaving it feeling a bit dry or brittle. It also requires extensive rinsing to remove all the residue. For a very greasy, tough fleece from a primitive or longwool breed where softness isn’t the primary goal, or for an emergency scouring session, Dawn is a workable, budget-friendly option, but use it with caution.

Namaste Farms Fibre Scour for Greasy Fleeces

Some fleeces are just on another level of greasy. If you work with primitive breeds, certain longwools, or just have a sheep that was a lanolin factory, you need a scour with serious power. Namaste Farms Fibre Scour was developed by a shepherd specifically to tackle these challenging, high-lanolin fleeces that leave other detergents struggling.

This is a professional-strength, concentrated formula that makes quick work of the stickiest, waxiest lanolin without requiring multiple washes. It’s built for efficiency and effectiveness on the toughest jobs. If you’ve ever been frustrated by a fleece that still feels tacky after two scouring cycles with a standard wash, this is your solution. For shepherds and spinners who regularly process "problem" fleeces, Namaste Farms is the heavy-duty cleaner that will save you time and frustration.

Dr. Bronner’s: A Natural Scouring Alternative

For the hobby farmer committed to using all-natural, biodegradable products, Dr. Bronner’s Pure-Castile Soap is a popular alternative to synthetic detergents. Made from vegetable oils, it’s a true soap, not a detergent, and it cleans effectively while being gentle on the environment. It’s a great fit for a farmstead focused on sustainable, closed-loop practices.

The most important consideration when using Dr. Bronner’s is your water hardness. Because it’s a soap, it can react with minerals in hard water to create soap scum, which can leave a dulling residue on your fleece. Using distilled water or adding a bit of washing soda to your scour bath can help, as can a mandatory final rinse with a splash of white vinegar. For those with soft water who prioritize natural ingredients, Dr. Bronner’s is an excellent, eco-friendly choice.

The Scouring Process: A Step-by-Step Guide

Regardless of the scour you choose, the basic method remains the same, with the primary rule being: hot water and no agitation. Felting happens from the combination of heat, moisture, and movement, so your goal is to let the hot water and degreaser do all the work.

1. Initial Soak: Start with a 20-30 minute soak in plain hot water (around 140-150°F or 60-65°C) to loosen dirt and dissolve some of the suint (sweat salts). This pre-wash removes a surprising amount of grime.
2. The Scour Bath: Drain the dirty water and refill your basin with fresh hot water. Dissolve your chosen scour completely before adding the wool. Gently submerge the fleece and let it soak for another 20-30 minutes. Do not stir, swish, or agitate it.
3. Rinsing: Carefully lift the wool out, allowing the dirty water to drain. Refill the basin with clean hot water at the same temperature. Submerge the wool and let it soak for 15-20 minutes. Repeat this rinse step until the water runs clear and you see no more suds.
4. Final Spin & Dry: Gently squeeze excess water out of the fleece (do not wring!). You can use the spin cycle of a top-loading washing machine or a dedicated spinner to remove most of the water before laying the fleece on a mesh rack to air dry.

Choosing Your Scour: pH and Fiber Type Matter

The single most important technical factor in choosing a scour is its pH level. Wool is a protein fiber with a naturally acidic coating. Using a highly alkaline (high pH) cleaner can damage the cuticle, the protective outer layer of the fiber, making it feel harsh and brittle. This is why products formulated for wool are typically pH-neutral or slightly acidic.

Consider this simple framework for your decision:

• For Fine, Delicate Fibers (Merino, Alpaca): Prioritize gentleness. Choose a pH-neutral, conditioning scour like Kookaburra or Unicorn Power Scour.
• For Medium, Durable Wools (Corriedale, Romney): You have more flexibility. A versatile workhorse like Orvus Paste or a powerful all-rounder like Unicorn are both excellent choices.
• For Greasy, Primitive Wools (Navajo-Churro, Jacob): You need maximum degreasing power. A heavy-duty scour like Namaste Farms is ideal.
• For General Use & Budget Concerns: If you’re in a pinch or working with a tough fleece, Dawn will work, but for anything valuable, a dedicated scour is a better investment.

Final Rinsing Tips for Squeaky Clean Fleece

The final rinse is your last chance to ensure a perfect result. A fleece that isn’t rinsed properly will feel slightly sticky or stiff after it dries, and this residue will affect your spinning and dyeing. The goal is to remove every last trace of the scouring agent.

A great final step is to add a splash of white vinegar to your last rinse bath. This helps to dissolve any remaining soap residue and restores the wool’s natural acidic pH, leaving the fiber feeling soft and closing down the cuticles. You’ll know your fleece is truly clean when you squeeze a wet lock and it makes a distinct "squeaking" sound between your fingers. Once you hear that squeak, your wool is ready for the drying rack.

Choosing the right scour isn’t just about cleaning—it’s about setting your fiber project up for success from the very beginning. By matching your degreaser to your specific fiber type and needs, you ensure the fleece you process becomes the best possible yarn it can be. Happy scouring, and even happier spinning.