Cleaning Wool Rugs

Wool tolerates cleaning better than any other natural rug fibre, provided the chemistry and the mechanics are right. Both are easy to get wrong in ways that are not obvious for months.

Why pH matters

Wool is keratin — a protein — and proteins are damaged by alkali. That is the whole reason for the rule.

Alkaline solutions strip lanolin faster than the fibre tolerates, leaving wool dull, brittle and measurably less soil-resistant. The damage is cumulative and quiet: a rug cleaned repeatedly with the wrong product does not fail dramatically, it just stops looking good and starts soiling faster.

Felting, and how to avoid it

Wool's cuticle scales interlock permanently under heat, moisture and agitation together. That is felting, and there is no way back from it — the affected area becomes dense, hard and visibly different.

Avoiding it is a matter of never combining all three:

• No hot water. Cold or lukewarm only.
• No scrubbing. Brush in the direction of the pile, never across or against it.
• No circular motion. It is agitation in every direction at once.

This is also why steam cleaning is prohibited on wool — it supplies heat and moisture simultaneously, and the machine supplies the agitation.

Routine care

Vacuum weekly with suction only, in the pile direction. Beater bars tear fringes and accelerate pile loss on older rugs.

Vacuum the reverse twice a year. Grit migrates down through the pile towards the foundation, and this is the only home method that gets it out. It matters more on wool than on synthetics because wool holds grit in its scaled surface.

Rotate every six months. Wool fades, and uneven fading is permanent.

Use a felt pad. Foundation abrasion is the dominant wear mechanism and a pad addresses it directly.

Spills

Wool's lanolin buys you time on water-based spills — a few minutes before penetration — which is why speed is worth so much here. Oil and grease are different: they penetrate readily and are a professional job on a rug of any value.

Pet urine is the genuine emergency. It is alkaline, and on wool it shifts dye permanently within hours. Blot everything you can, do not apply anything else, and call a rug plant the same day.

Washing

A small, colourfast, all-wool rug can be washed at home on a hard outdoor surface — the full sequence, including the colourfastness test that decides whether to start, is in washing a wool rug.

Anything larger than about 4×6 feet, anything old, and anything that fails the colourfastness test belongs in a rug plant. Proper washing means dusting first, then immersion, then rinsing until the water runs clear, then controlled drying — see DIY vs professional.

Every three to five years in normal domestic use. The schedule by traffic level is in how often to clean, and the errors worth knowing about are in common mistakes.

Moths

Wool is food. Prevention is entirely about not creating the conditions moths want: dark, undisturbed and soiled.

Lift the rug and inspect the underside twice a year, particularly under furniture and along walls. Vacuum those areas properly rather than around them. Never store a wool rug unwashed. Signs of an active infestation are fine sand-like frass, silky webbing, and patches where the pile lifts away cleanly from the foundation.