Cleaning a wool rug

Wool is a protein fibre with a scale structure and a natural fatty film of lanolin. The lanolin makes the fibre water-repellent, antistatic and dirt-resistant. Fresh wool from the highlands repels spilled liquid for several minutes before it sinks in. That protective layer is exactly what aggressive cleaners wash out first.

The scale structure is also responsible for wool's characteristic behaviour: with heat and movement the scales interlock and the fibre felts. Once a wool rug has felted, it cannot be returned to its original state.

Anyone who understands this has already grasped half of the care rules: no loss of lanolin, no felting.

Vacuuming is the most important care routine. Once or twice a week is enough for a typical living room. Use a smooth nozzle without a rotating brush. Rotating brushes pull individual wool fibres out of the knot and visibly accelerate wear.

Always vacuum in the direction of the pile. You can identify it by running your flat hand across the rug: in one direction the pile feels smooth, in the other rough. The smooth direction is the pile direction.

Rotate the rug 180 degrees every six months. That distributes sunlight and walking lines evenly.

Under furniture and along the edges you may vacuum less often, but not never. Moths prefer to lay their eggs in dark, undisturbed areas.

For a wool rug, the rule is: as little water as possible. Fresh stains are blotted out with a dry cloth, not washed out. Only when blotting picks up nothing more do you bring in a damp cloth, and even then with cold water and only a drop of wool detergent.

Dried-in stains are treated with a paste of cornstarch or baking powder. Sprinkle on, let it sit for 30 minutes, brush out with a soft brush in the direction of the pile, then vacuum. The powder pulls residues out of the fibre without soaking it.

For stubborn spots there are specialised dry foam cleaners for wool, applied with a sponge, worked in briefly and vacuumed off once dry. They are more expensive than all-purpose cleaners, but the only safe option besides water.

Myth 1: Wash with shampoo. Wrong. Shampoo contains surfactants that pull lanolin out of the fibre. A single use may leave no visible damage, but regular use makes the wool permanently dry and brittle.

Myth 2: Clean with snow. Partly true. Clean dry snow pulls dust out of the pile if you briefly roll up the rug, lay it in the snow and then beat it out. The method works, but it suits only robust pieces and is impractical in many regions.

Myth 3: Refresh colours with sauerkraut juice. Ineffective and counterproductive. The smell stays, the depth of colour does not measurably change.

Myth 4: Foam it up with washing-up liquid and warm water. Severe damage. Surfactants dissolve lanolin, warm water encourages felting, and detergent residues bind dirt, so the rug looks worse after a short time than before.

A wool rug needs professional wet cleaning in running water every three to five years. This is not optional, it is the prerequisite for a service life beyond 50 years.

A Hamburg rug wash takes 5 to 14 days, the rug is cleaned flat in a water bath with pH-neutral specialised cleaners, then dried flat and brushed. Cost between 80 and 200 euros for a medium-sized piece.

Avoid at all costs: hot-water extraction with industrial machines, as commercial carpet cleaners often offer. These methods are optimised for wall-to-wall carpet, not for hand-knotted wool rugs. They can loosen knots and make colours bleed.

Ask specifically about experience with oriental rugs, pH-neutral cleaners, and flat drying. Anyone who does not clearly confirm these three points is not the right provider.

Three situations need professional help directly in the home. First: heavily soiled rugs from households with pets. Here a normal wash is often not enough, because urine has soaked deep into the backing and stays there. Specialised odour neutralisation is needed before the wash.

Second: moth infestation. Visible bald spots or fine dust next to the rug point to larvae. Have the rug examined on site and, if necessary, professionally treated with heat or cold before sending it to the wash. Otherwise eggs travel with it.

Third: old pieces with brittle warp threads. A wet wash here can cause further damage. An experienced restorer assesses the condition and recommends either a gentle dry cleaning or a special stabilisation before the wash.