Caring for a wool rug: what wool needs and what harms it

Why wool looks after itself

The fibre is surrounded by a natural layer of grease, lanolin. It ensures that liquid initially stays on the surface instead of soaking in straight away. If you react quickly, you can get most stains out completely.

Then there is the crimp of the fibre. It lets dirt lie between the fibres instead of holding on to it – which is why a wool rug looks clean for longer than a smooth, plain fibre surface, and why regular vacuuming is enough as basic care.

Wool also absorbs moisture from the air in the room and releases it again without feeling damp. This has a balancing effect on the indoor climate, but it also means that a wool rug must dry out thoroughly after any wet cleaning.

The first weeks: wool sheds

A new wool rug loses loose fibres, and plenty of them. This is not a defect but fibre left over from production that was not bound in during knotting or tufting.

This settles down after four to twelve weeks. During this time, vacuum more often, without a brush, and do not be alarmed. Handmade and high-pile rugs generally shed for longer and more noticeably than short-pile, tightly woven ones.

Shedding should be distinguished from what is known as sprouting: individual longer fibres that push out of the pile. They are cut off flush with scissors, never pulled out, because otherwise a whole loop comes with them.

Vacuuming correctly

Without a rotating brush. A beater bar or brush roll tears fibres out of the weave in wool and makes the surface fuzzy. A smooth nozzle is enough. Vacuuming the surface once or twice a week is sufficient as basic care.

It makes sense to work in the direction of the pile and to reduce the suction rather than turn it up fully. In heavily used areas you can vacuum more often than in quiet corners – wear occurs where sand lies under shoes.

There are rugs with fringes as well as rugs without. Where fringes are present, they are not vacuumed but straightened by hand, because they tear out easily.

Much less often – once or twice a year – the rug should also be turned over and vacuumed from the back. This yearly measure does not replace the weekly vacuuming of the surface but complements it: otherwise the fine sand that settles between the fibres acts like sandpaper from within.

Stains: lift rather than rub

Liquid is dabbed up with an absorbent cloth, from the outside inwards. Rubbing presses the stain into the fibre and starts to felt the surface – that is the real damage, not the stain.

Solids are first left to dry and then brushed or vacuumed off. If you work on wet soil straight away, you spread it.

For stubborn spots, lukewarm water with a drop of wool detergent helps. Afterwards, dab with clean water and blot up the remaining moisture with something dry. Always test on a hidden spot first to make sure the colour does not run.

It makes sense to work from the outside towards the centre and to use only as much liquid as can be lifted out again afterwards. A ring usually comes not from the stain itself but from too much water carrying the dissolved dirt outwards.

What permanently damages wool

Heat. Hot water or a steam cleaner makes wool felt. The process is irreversible – the fibre scales hook into one another and the surface becomes hard.

Alkaline cleaners. Most all-purpose cleaners are alkaline and strip out the lanolin. Afterwards the rug no longer repels dirt and the fibre becomes brittle. Wool detergent is therefore formulated to be pH-neutral to slightly acidic.

Bleach and oxygen cleaners. They attack the fibre and draw colour out of the material.

Persistent wetness. Wool absorbs a lot of moisture without appearing wet. If it does not dry out completely, odour develops, and in the worst case mould in the subfloor.

Direct sun. Over the years it bleaches the colour unevenly. A rug that lies half in a strip of light acquires a visible edge.

Friction at an edge. Where a rug runs over a threshold or the edge of a step, the pile wears through along a narrow line. Such spots cannot be repaired, only avoided.

Subfloor, underlay and indoor climate

A suitable rug underlay noticeably extends its lifespan. It keeps the rug in place, prevents creases and cushions part of the pressure that would otherwise grind the fibre between sole and floor.

The subfloor must not be permanently damp. On freshly laid or mopped floors, a wool rug should only be put back down once the surface is completely dry. Well-ventilated rooms prevent odour and moth infestation alike.

Moths and carpet beetles seek out dark, undisturbed spots – under furniture that is rarely moved, for instance. Regularly uncovering and vacuuming these areas deprives them of their habitat; that is more effective than any product.

Removing pressure marks

Where a furniture leg stands, the fibre is pressed flat. This can usually be remedied. Place an ice cube on the spot and let it melt, then blot up the moisture and lift the fibres again with your fingers or a soft brush. Wool stands back up because the fibre has a memory of its crimp.

Coasters under furniture legs help to prevent this, as does occasionally turning the rug through 180 degrees so that load and light are distributed evenly. Rearranging heavy furniture also works: a spot that never bears weight ages differently from one that carries it permanently.

When vacuuming is no longer enough

After a few years even a well-kept wool rug loses its freshness, because fine dirt collects deep in the pile. Then a thorough cleaning makes sense – as a rule of thumb about every three to five years, sooner with heavy use.

Specialist firms use methods designed for wool and then dry the rug under controlled conditions. It is important to name the fibre when placing the order, so that the cleaning is neither too hot nor alkaline. Cleaning in the bath or with a garden hose, by contrast, often ends with felting, run colours and a rug that takes days to dry out.

In between, a little goes a long way: a rug that is aired outside on a dry day and carefully beaten looks noticeably fresher afterwards. Beat it from the back and gently, not with full force.