Wool, Silk and Viscose Rugs: What Cleans Them and What Ruins Them

The single most useful thing you can know about your rug is what it's made of, because wool, silk and viscose need three different approaches and the wrong one is permanent. Wool is forgiving. Silk is delicate but stable. Viscose behaves badly with water, which is a problem, because water is what most people reach for.

If you've ever spilled a glass of something on a rug, dabbed at it with a wet cloth, and been left with a yellow-brown ring that's bigger and more obvious than the original spill, you've met a viscose rug.

Work out what you've got first

Check the label on the underside first, usually stitched into a corner or the binding. If it's there, believe it.

If there's no label, three quick tests get you most of the way.

The feel. Wool is springy and slightly coarse, and it bounces back when you squeeze a handful. Silk is cool, fine and very smooth, with a lustre that changes as you move around it. Viscose feels silky but flatter and slightly slippery, and the pile crushes and stays crushed.

The pile direction. Viscose shows dramatic light and dark patches depending on which way the pile lies, and they look like water marks even when the rug is bone dry. That shading is the single most reliable tell. Sellers call it "shimmer" or "sheen", which is fair enough, but it's the same property that makes it a nightmare to clean.

The burn test, if you can spare a fibre. Pull a single strand from the back or the fringe. Wool and silk smell of burnt hair and self-extinguish, leaving a crushable black bead. Viscose smells of burning paper and leaves a soft grey ash, because it's made from wood pulp.

The names are also a giveaway. If your rug was sold as art silk, artificial silk, banana silk, bamboo silk or faux silk, it is viscose. Those terms are marketing, not fibre content.

Wool: the forgiving one

Wool is genuinely good stuff for a rug. It has a natural crimp that hides soil, it releases dirt reasonably well, and it takes wet cleaning better than any other natural fibre in a rug.

The rules with wool are about temperature and agitation rather than water itself. Woolmark's own care guidance for wool is lukewarm water at around 30°C for hand washing, gentle action rather than rubbing, a neutral mild detergent, and flat drying afterwards. Everything that goes wrong with wool goes wrong because someone ignored one of those four.

What actually damages a wool rug:

• Hot water and agitation together, which felts the fibres. Once wool has felted it has permanently shrunk and hardened, and it does not come back.
• Alkaline or high-pH cleaners, which strip the natural lanolin and leave the pile harsh and dull. Wool wants a mild acid side, not a strong alkaline one. This is the opposite of what works on a synthetic carpet, which is why one bottle of "carpet shampoo" does not suit both.
• Bleach or oxygen boosters, which dissolve the protein. Wool is a protein fibre, like hair.
• Drying it wrong, especially over a radiator or folded, which sets distortion into the shape.

Vacuum a wool rug regularly with the beater bar off or raised, and never vacuum the fringes, which is how they get chewed and shortened.

The moth problem nobody warns you about

This catches a lot of London households, particularly in older flats with rugs that don't move.

The Natural History Museum notes that the two moths most commonly found in UK homes are the common clothes moth and the case-bearing clothes moth, and that it is the immature larvae rather than the adult moths that cause damage to natural fibres such as woollen clothing, upholstery, carpets and furs. The larvae are adapted to feed on keratin, the protein in wool, and the museum notes that infestations have become more common in recent years.

Larvae want dark, still, undisturbed places. The two spots they love in a real house are under the sofa and under the bed, which is exactly where a rug never gets vacuumed.

The prevention is genuinely simple: move the furniture and vacuum underneath a few times a year. If you find bald patches, gritty debris, or fine silken tubes in the pile, that's not wear, and a professional clean removes the eggs and larvae from the fibre as well as the soil.

Silk: delicate, but not impossible

Real silk rugs are usually finely knotted, expensive, and worth treating properly.

Silk is a protein fibre like wool, so the same bans apply: no bleach, no strong alkaline, no hot water. Silk adds two problems of its own. It is much weaker when it is wet, so scrubbing a damp silk pile abrades it and dulls the sheen permanently. And it is prone to water marking, where a droplet dries with a hard tide line around it.

The practical advice for a silk rug at home is short. Vacuum gently with a suction-only tool. Blot spills immediately with a white cloth, pressing, not rubbing. Keep it out of direct sunlight, which fades silk faster than any other rug fibre. And then leave the rest to someone with the equipment to control moisture and dry it flat under tension.

There is one honest sting. Many rugs sold as silk are viscose, and plenty of people find out only when a cleaner tests the fibre. If your "silk" rug was inexpensive, the burn test is worth doing before you plan anything.

Viscose: handle with real care

Viscose, rayon and lyocell are regenerated cellulose. They start as wood pulp, get dissolved, and get extruded into fibre. They look wonderful and they behave like paper.

Three things happen when a viscose rug gets wet:

It loses strength. Wet cellulose fibres swell and weaken, so pile that is fine when dry crushes, splays and mats under any pressure while damp. Walking on a wet viscose rug will leave a permanent flattened track.

It yellows. Cellulose browning is a real and well-known phenomenon. Moisture draws natural sugars and residues up through the fibre to the surface, where they oxidise and dry as a yellow-brown ring. This is why a clean water spill leaves a dirty-looking mark.

It goes stiff and dull. The sheen that sold you the rug is a surface property of the fibre lying flat and smooth. Disturb it while wet and it does not lie flat again.

What that means practically: no wet cleaning at home, ever. Blot spills immediately, with pressure and a white cloth, and stop while the area is still barely damp. Do not saturate. Do not use a home carpet washer. Do not steam it.

A viscose rug can be cleaned properly, but it needs low-moisture methods, controlled drying and pile grooming, which is exactly the sort of thing our rug cleaning service exists for. It is one of the few cleaning jobs where "leave it and call someone" genuinely is the cheaper option.

Rugs on top of other floors

Two practical points that come up constantly on London jobs.

If a rug sits on a wood or stone floor, the rug and the floor need different products, and the wrong one migrating between them causes problems. Acidic wool-safe cleaners are a bad idea on a marble or limestone floor, for reasons we cover in our guide to why tile grout goes dark. It is usually simplest to do the rug and the hard floor in the same visit rather than separately.

And if a rug has been sitting damp on a solid floor, check underneath before you do anything. Rugs trap moisture, and a rug that smells musty is often a symptom rather than the problem.

When a rug is worth cleaning and when it isn't

We'd rather say this plainly.

Worth doing: a wool rug that's gone dull and flat, any rug in a household with pets or hay fever, a rug that's part of a rented property's inventory, anything that's had a spill, and any wool rug that hasn't been lifted and vacuumed underneath in years.

Worth doing carefully: silk and viscose, where the method matters far more than the effort.

Probably not worth it: a cheap synthetic rug with worn, matted traffic lanes. Matting is fibre damage, not soil, and cleaning does not undo it.

Rugs often get done alongside something else, since the whole floor is already being worked on. Most of ours go through as part of a carpet cleaning visit, an end of tenancy clean, or a one-off deep clean of a whole property.

FAQ

Can you steam clean a wool rug? Hot water extraction can be used on wool by someone who controls the temperature, the pH and the drying, and that is how most professional wool rug cleaning is done. A domestic steam mop or a hired machine run hot is a different thing entirely, and it is how wool gets felted.

How do I know if my rug is silk or viscose? The burn test on a single fibre is the reliable one: silk smells of burnt hair and forms a brittle bead, viscose smells of burnt paper and leaves soft ash. Price and pile shading are strong hints, but the burn test settles it.

Can a browned viscose rug be fixed? Sometimes, and it is skilled work rather than a quick pass. Cellulose browning can often be reduced significantly with the right treatment, but severe or old browning may only improve rather than disappear. Do not try to bleach it out.

How often should a rug be professionally cleaned? Every 18 months to three years for a rug in a living room, more often with pets or children, longer for a rug in a low-traffic room. Regular vacuuming, including underneath, extends the gap considerably.

Can I use a hired carpet cleaning machine on my rug? On a synthetic rug, carefully, yes. On wool it risks over-wetting and felting. On viscose it is close to guaranteed damage. Hired machines put down far more water than they recover, and the drying is what causes most of the harm.

Does professional cleaning remove pet smells from a rug? Usually, if the contamination is in the pile. If urine has gone through the backing into the underlay or floor beneath, cleaning the rug alone won't fix it, and we'll tell you that when we inspect rather than after.

Getting yours looked at

Send us a photo of the rug and a close-up of the label if it has one, and we'll tell you the fibre, the method, and what to expect before anyone commits to anything. If it's a rug we'd leave alone, we'll say so.

Get a free, no-obligation quote, call 07375 104665, or message us on WhatsApp at wa.me/447375104665 for a same-day quote.

Last updated: 26 August 2026

About Techno Clean: a London deep-cleaning company covering North London and the Hertfordshire borders. We specialise in one-off deep cleans, end of tenancy and after builders cleaning, fully insured with £5 million public liability cover and DBS-checked teams, rated 4.9 from over 180 reviews across 500+ completed jobs.