A hand-knotted rug is remarkably tough. It was built to be walked on for decades, and ordinary use is rarely what ruins one. Most of the damage that arrives at a rug workshop was caused by someone trying to help.

This article covers the years in between: what to do at home between two professional washes — how to vacuum, what to do in the first minute after a spill, and, just as importantly, what to leave alone. What happens during a professional wash is described on the page about rug cleaning.

Vacuuming

Regular vacuuming is the most effective care there is, and not for the reason most people assume. Sand and grit work their way down to the base of the knots, and every step grinds them against the wool like emery paper. What sits on the surface does little harm. What sits underneath cuts the fibre.

Direction

Always vacuum with the pile. Run your hand across the rug: one direction feels smooth, the other resists. The smooth one is the direction of the pile; working against it tugs at the knots without lifting any more dirt.

The brush bar

On a hand-knotted rug the rotating brush bar — the beater bar — stays switched off. It was designed for fitted carpet, whose fibres are bonded into a backing. A knotted rug has no backing: the brush catches individual pile threads and, over months, works them out of the knot. Most machines have a switch for it, or a hard-floor head.

Fringes

The fringes are not decoration. They are the ends of the warp threads — the frame the whole rug is built on. A vacuum that swallows a fringe pulls on the structure itself, and a torn fringe takes part of the weave with it. Keep the nozzle off them and straighten them by hand; if they have matted, comb them out with your fingers rather than a brush.

How often

Once or twice a week where the rug is walked on, every second week elsewhere. Once a month, turn it over and vacuum the back: the sand that has worked into the weave drops out from that side, and no vacuuming from above will reach it.

First aid for spills

With a spill, the first minute decides the outcome. Three rules apply, whatever has gone on the floor.

Blot, do not rub. Rubbing drives the liquid into the knots and felts the pile at the same time: the stain becomes a patch of altered texture that stays visible long after the colour has come out. Take a white cloth — a coloured one can give up its own dye — and press.

Work from the outside in. Otherwise you push the edge of the stain outwards and end up with a larger one.

Cold water, nothing else. Warm water sets protein stains and can loosen dyes. The first response needs nothing beyond cold water and patience.

By type of spill

Red wine. Lift as much as you can, at once, then blot with cold water and lift again. No salt: it does draw liquid, but it leaves a residue in the fibre that is harder to remove later than the wine. And no white wine — a stubborn myth.

Oil and grease. Not with water, which only spreads it. Take off the excess, sprinkle cornflour or unperfumed talc over the mark, leave it several hours to draw the oil out, then vacuum off. Whatever remains belongs in professional hands.

Coffee and tea. As with wine: lift, blot cold, lift again. Both contain tannins, which bind to wool as they dry — speed counts for more here than elsewhere.

Pet hair. Not a stain, but the most frequently asked question. A rubber glove, dampened and drawn across the pile, brings out more than any vacuum; a lint brush worked with the pile is the alternative.

Urine. The one case where hurry genuinely matters. Urine is alkaline and attacks dyes as it dries. Absorb as much as you can, dilute with cold water, absorb again — then have the rug washed properly, and soon. Household remedies mask the smell; the cause stays in the foundation.

What you should never do

A steam cleaner. Heat and moisture together are the surest way to ruin a hand-knotted rug: dyes can bleed, wool felts, and the moisture reaches the foundation without a route back out.

The washing machine. This holds for small formats too, and for the wool cycle. The mechanical action inside the drum felts the pile irreversibly, and nothing undoes it afterwards.

Vinegar, bleach, household stain removers. Vinegar is acidic, bleach attacks dye, and most stain removers were formulated for synthetic fibres. Wool is a protein: it behaves like hair, not like polyester.

Carpet shampoo and foam. The foam is worked in and dries in place, and the residue then binds dirt to the fibre. The rug is briefly clean and, months later, dirtier than before.

Drying it in the sun. Direct sunlight bleaches wool quickly and unevenly. Dry a damp rug flat and in the shade, with air moving around it.

Rotating, airing, underlay

Rotate it. Once a year, through 180 degrees. Two things then spread evenly instead of concentrating: foot traffic and daylight. A rug that lies the same way for years ends up with a light half and a dark half, and that cannot be reversed.

Air it. Twice a year for a few hours over a balcony rail or a washing line — in the shade. It takes moisture out of the fibre and is the simplest protection against moths there is.

Underlay. Non-slip underlay is not only a safety question. It holds the rug in shape, stops it rucking up and absorbs part of the load of every footstep. On a wooden floor it should not be the adhesive kind — a tacky coating can leave residue on oiled or waxed boards.

Dents from furniture. Put an ice cube on the crushed spot, let it melt, and lift the pile with your fingers as it dries. On wool it almost always comes back.

One point that is easy to miss: size is a durability question too. A rug too small for its room takes all the traffic on one narrow strip, which then wears out years before the rest. The article on rug sizes for the living room works the formats out in detail.

Living room with a well-kept hand-knotted rug

A rug over underfloor heating

A question that now applies to nearly every new build, and one surrounded by half-knowledge. The short answer: a hand-knotted wool rug and underfloor heating get along well, as long as two things are watched.

Thermal resistance. Every layer on the floor insulates. The rule of thumb is a maximum of 0.15 m²K/W for floor covering and underlay together — 1.5 tog on the scale British suppliers print on the label, about R-0.85 in American terms. Above that the heating has to run warmer for the same room temperature. A low-pile hand-knotted rug is normally well inside the limit; a thick high pile over a foam underlay is not.

The underlay. Foamed non-slip underlays insulate considerably, often more than the rug lying on them. Over underfloor heating a thin woven mesh is the better choice: it holds the rug just as reliably and barely insulates at all.

What you should not do is bring the heating up under the rug faster than in the rest of the room. Wool takes moisture out of the air and gives it back; rapid changes in temperature make the foundation move. Steady warmth is no problem. Swings are.

A yearly rhythm

All of this fits into a routine that costs almost no time and makes the difference between a rug that still looks good after twenty years and one that does not.

When	What
weekly	Vacuum with the pile, brush bar off, fringes left alone
monthly	Vacuum the back, move the furniture and vacuum underneath
twice a year	Air it in the shade, check edges and fringes for damage
yearly	Turn it 180 degrees, check the underlay
every few years	Professional wash, depending on traffic

When it needs a professional wash

The honest limit of everything above: it keeps a rug in good condition, but it does not clean it. The sand and dust that gather at the base of the knots over years cannot be vacuumed out — for that the rug has to be wetted through and rinsed.

It is time for a professional wash when:

the rug has not been washed for several years,
the colours look flat although the rug looks clean,
a stain is still visible after first aid,
it has got wet — then promptly, because of the risk of mould,
a smell will not go away.

As a rough guide, a few years between washes, depending on how much the rug is walked on. What happens during a professional wash is described on the page about rug cleaning. Where the damage is structural — an open selvedge, torn fringes, a hole — repair is the right route, and the sooner the better: an open edge grows with every day it is walked on.

Moths

Briefly, because the subject deserves an article of its own. Moths go for wool, not synthetics, and they prefer dark, still, undisturbed places: under the sofa, under a cupboard, inside a rug rolled up in a cellar. A rug that is vacuumed, turned and aired regularly is the least attractive home you can offer them.

The warning signs are fine woolly dust, bald patches that feel soft under the hand, and pale silken threads on the back. Anyone who finds them should not treat the rug themselves — moth products from the shelf do not reliably reach the larvae inside the weave, and the time lost costs substance.

And if you are unsure whether what you see is normal wear or something that needs attention: that is a judgement made in a couple of minutes with the rug in front of you, and hardly at all from a distance. A phone call settles it faster than an evening of reading — and finding out whether anything needs doing at all costs nothing.