You pick up a lock from a freshly shorn fleece and it feels different from anything you've bought pre-washed. It's slightly waxy, maybe a little sticky, and it smells like lanolin and the outdoors. That's grease wool — and it's one of the most traditional fiber preparation experiences a hand spinner can have.
But it also behaves differently in the combs. And knowing what to expect before you load the first lock makes the whole process go a lot more smoothly.
When working with raw fleece, many spinners encounter wool that still contains its natural lanolin and dirt. This unwashed fiber is commonly called grease wool. While grease wool can be beautiful and full of character, it behaves differently when used with wool combs. This guide explains what grease wool is, how it affects wool combing, and what spinners should consider when preparing fleece for combing.
What Is Grease Wool?
Grease wool refers to fleece that still contains the sheep's natural lanolin along with dust, dirt, and vegetable matter collected during the animal's life. The lanolin protects the fiber from moisture and environmental conditions while the sheep grows the fleece. When freshly shorn fleece is handled, it often feels slightly sticky or waxy because of the lanolin content.
Grease wool usually contains lanolin (natural wool grease), dirt and dust, vegetable matter such as hay or straw, and the natural lock structure from the fleece. It is different from skirted fleece — skirting refers to removing the heavily soiled or low-quality edges of the fleece before sale or use, and a skirted fleece can still be grease wool (unwashed but with the worst parts removed). Most fleeces sold at fiber festivals have been skirted but are still in the grease unless specifically labeled as washed.
How Grease Wool Behaves in Wool Combs
Grease wool behaves differently from washed fiber during combing. The lanolin makes the fibers slightly sticky, which changes how they move between comb tines — they tend to cling together rather than separating and transferring cleanly. Vegetable matter and short fibers also tend to stay embedded in the fiber mass rather than falling away during combing. On the positive side, lanolin reduces static and can help the fiber feel cohesive during loading, and the natural lock structure often remains intact, which can make loading the comb easier in some situations.
| Fiber Condition | Typical Combing Behavior | What to Expect |
|---|---|---|
| Grease wool | Slightly sticky; fiber clings together | More debris, slower transfer, more comb cleaning needed |
| Washed wool | Separates and transfers more freely | Cleaner combing, smoother alignment, less cleanup |
Because grease wool contains natural oils and debris, the combing process may remove more waste material compared to washed fiber. Learn more about why some wool is hard to comb.
Should You Wash Wool Before Combing?
For most spinners, washing the fleece before combing produces better results with less effort. Clean fiber transfers more freely between combs because the lanolin and dirt that cause stickiness and resistance have been removed. The combing process is faster, the tines stay cleaner, and the resulting combed top is typically smoother and more evenly aligned. Washing also removes vegetable matter that would otherwise interrupt the fiber transfer.
That said, combing in the grease is a traditional approach that many hand spinners have used for generations, and it can still produce excellent results with good technique. Some spinners spin directly from grease wool combed top and then wash the finished yarn — a traditional approach sometimes called spinning in the grease. The lanolin in the fiber can make drafting feel smooth and pleasant. The main trade-off is that the combed top may not be as clean or as evenly aligned as top produced from washed fiber, and the combs will need more frequent cleaning. A fleece with very high lanolin content — like Merino or Rambouillet — will feel heavily waxy and may be very difficult to comb in the grease; washing first is almost always the better choice for high-lanolin breeds. Learn more about choosing the right wool combs.
How to Prepare and Comb Grease Wool
If you choose to comb in the grease, a few preparation steps make the process go more smoothly. Before loading the fiber onto the combs, gently shake or pick through the fleece to remove large debris — hay, straw, and obvious vegetable matter. Choose cleaner portions of the fleece where possible, as heavily contaminated locks will slow the combing process and fill the tines with debris quickly.
Load small amounts onto the combs — grease wool often works best with lighter charges than washed fiber because the stickiness makes dense charges harder to transfer. Use steady, controlled transfers rather than aggressive pulling, and repeat passes until the fiber begins to align. Expect the process to feel slightly slower and more deliberate than combing washed fiber. Learn more about proper fiber loading.
Cleaning Wool Combs After Grease Wool
Because grease wool contains lanolin and debris, combs need to be cleaned after use — more frequently than after combing washed fiber. Start by removing all loose fiber from the tines using a fine-toothed comb or stiff brush. Once the loose fiber is cleared, wipe the tines with a dry or slightly damp cloth to remove lanolin residue. For heavier buildup, a small amount of dish soap on a cloth can cut through the lanolin effectively — rinse and dry the tines thoroughly afterward to prevent rust on metal tines. Avoid soaking wooden comb handles in water.
Regular cleaning after each grease wool session prevents lanolin buildup from accumulating and keeps your wool combs transferring fiber smoothly. Lanolin is not corrosive or harmful to metal or wood, so it will not damage well-made combs — but it does reduce their effectiveness if allowed to build up over multiple sessions without cleaning.
Evaluating Results and Deciding What Works for Your Fiber
After combing grease wool, evaluate the results honestly. If the combed top is reasonably smooth and aligned, the noil yield is acceptable, and the process felt manageable, combing in the grease is working for that fleece. If the transfer was a constant struggle, the noil pile is larger than the combed top, or the tines are clogged after every pass, washing the fleece first will almost certainly produce better results.
The best choice often depends on the condition of the fleece, the lanolin content, the staple length, and the spinner's preference. Both approaches can work — and many spinners try both before settling on a preference. What matters most is that the preparation method produces fiber that drafts well and spins the way you want it to.
Key Takeaways
- Grease wool is fleece that still contains its natural lanolin, dirt, and vegetable matter — it is different from skirted fleece, which has had the worst portions removed but may still be unwashed
- Lanolin makes grease wool slightly sticky in the combs — fibers cling together rather than separating cleanly, vegetable matter stays embedded, and the tines accumulate residue faster
- Combing in the grease is a traditional approach that can produce usable combed top — many spinners spin directly from grease wool top and wash the finished yarn afterward
- Washing before combing produces better results for most spinners — clean fiber transfers more freely, the combing process is faster, and the combed top is typically smoother and more evenly aligned
- High-lanolin breeds like Merino and Rambouillet are especially difficult to comb in the grease — the waxy stickiness makes transfer sluggish and washing first is almost always the better choice
- Grease wool combing works best with lighter loading, slower and more deliberate transfers, and cleaner lock selection — the same principles as washed fiber but applied more carefully
- Combs need to be cleaned after every grease wool session — remove loose fiber, wipe tines to remove lanolin residue, and use dish soap for heavier buildup; dry metal tines thoroughly to prevent rust
- Evaluate results after each session — if the process felt manageable and the top is usable, combing in the grease is working; if transfer was a constant struggle or noil exceeded usable top, washing first will improve results
Frequently Asked Questions
Can you comb grease wool?
Yes — grease wool can be combed, and it is a traditional approach that many hand spinners have used for generations. The lanolin in the fiber acts as a natural lubricant that can help the fiber move through the tines, though it also makes the fiber feel stickier than washed wool and causes more debris to accumulate in the combs. The process works best with lighter loading, slower and more deliberate transfers, and regular cleaning of the comb tines between sessions. For spinners who enjoy working with raw fleece, combing in the grease is a perfectly viable preparation method.
Is it better to wash wool before combing?
For most spinners, washing the fleece before combing produces better results with less effort. Clean fiber transfers more freely between combs because the lanolin and dirt that cause stickiness and resistance have been removed. The combing process is faster, the tines stay cleaner, and the resulting combed top is typically smoother and more evenly aligned. Washing also removes vegetable matter that would otherwise interrupt the fiber transfer. That said, some spinners prefer the traditional experience of combing in the grease, and the results can still be excellent with good technique and appropriate fiber.
Does lanolin affect wool combing?
Yes, lanolin has a noticeable effect on how wool behaves during combing. It makes the fibers slightly sticky, which can cause them to cling together rather than separating and transferring cleanly between combs. This stickiness also means that vegetable matter and short fibers tend to stay embedded in the fiber mass rather than falling away during combing. On the positive side, lanolin reduces static and can help the fiber feel cohesive during loading. The net effect is that grease wool usually requires more careful technique and lighter loading than washed wool to achieve clean fiber transfer.
Will grease wool damage wool combs?
No — grease wool will not damage well-made wool combs. The tines are designed to handle raw fiber, and lanolin is not corrosive or harmful to metal or wood. However, lanolin does build up on the tines over time, which can make the combs feel sticky and reduce their effectiveness if not cleaned regularly. After combing grease wool, it's good practice to remove loose fiber from the tines, wipe them down to remove lanolin residue, and occasionally wash the comb heads if buildup becomes significant. Regular cleaning keeps the combs performing well and extends their working life.
How do I know if my fleece has too much lanolin to comb?
A fleece with very high lanolin content will feel heavily waxy or greasy to the touch — almost like the fiber has been coated in a light oil. When you try to load it onto the combs, the locks may clump together and resist separating, and the transfer between combs will feel sluggish and sticky rather than smooth. Some breeds, particularly Merino and Rambouillet, can have very high lanolin content that makes combing in the grease quite difficult. If the fiber feels excessively waxy and the combing process feels like a struggle from the first pass, washing the fleece before combing will almost certainly produce better results.
Does combing in the grease produce usable combed top?
Yes — combing in the grease can produce usable combed top, though it will still contain some lanolin and may feel slightly waxy compared to top combed from washed fiber. Many spinners spin directly from grease wool combed top and then wash the finished yarn, which is a traditional approach sometimes called spinning in the grease. The lanolin in the fiber can actually make drafting feel smooth and pleasant. The main trade-off is that the combed top may not be as clean or as evenly aligned as top produced from washed fiber, and the combs will need more frequent cleaning.
How do I clean wool combs after combing grease wool?
Start by removing all loose fiber from the tines — a fine-toothed comb or a stiff brush works well for this. Once the loose fiber is cleared, wipe the tines with a dry or slightly damp cloth to remove lanolin residue. For heavier buildup, a small amount of dish soap on a cloth can cut through the lanolin effectively — just rinse and dry the tines thoroughly afterward to prevent rust on metal tines. Avoid soaking wooden comb handles in water. Regular cleaning after each grease wool session prevents buildup from accumulating and keeps the combs transferring fiber smoothly.
What is the difference between grease wool and skirted fleece?
Grease wool refers to any unwashed fleece that still contains its natural lanolin — it is a description of the fiber's washing status, not its quality. Skirted fleece refers to a fleece that has had the heavily soiled or low-quality edges removed — the skirt — before sale or use. Skirting is a quality preparation step that removes the dirtiest, most vegetable-contaminated, and shortest-staple portions of the fleece. A skirted fleece can still be grease wool (unwashed but with the worst parts removed), or it can be washed after skirting. Most fleeces sold at fiber festivals have been skirted but are still in the grease unless specifically labeled as washed.
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