Codes W, S, WS and X: how to read a sofa care label

Many sofas carry a small label with a single letter: W, S, WS or X. This Anglo-Saxon marking has spread to manufacturer labels distributed in Europe, France included. It provides a quick hint about what type of cleaning may be considered — but it is neither universal, nor mandatory, nor sufficient. This article explains what these codes mean, what they don't guarantee, and how to avoid mistakes that damage a sofa.

Where to find the care label

The label can sit under a removable cushion, at the back of a backrest, inside a zipped cover, sewn to the lower band, or sometimes inside a sofa-bed's storage box. On a fixed non-removable sofa it is more discreet. Take the time to find it before any treatment: it changes the whole cleaning plan.

General meaning of the codes

What each code allows — and doesn't

Code W

It indicates that a water-based treatment may be considered. It does not mean any liquid household cleaner will do: too alkaline, too concentrated or poorly rinsed can halo, discolour or stain. W does not guarantee that water won't migrate dyes or lift a pre-existing halo.

Code S

It suggests a solvent-based product (professional dry cleaner) may be considered. It absolutely does not mean the user should experiment with acetone, white spirit, petrol, nail polish remover or any household solvent: those are dangerous, flammable, and can destroy synthetic fibres. Read S as 'prefer professional dry cleaning'.

Code WS / W-S

It signals that the fabric in principle accepts both approaches. It does not allow mixing water and solvent, or stacking attempts: each method still requires a hidden-area test.

Code X

It signals that wet cleaning is not recommended. Vacuum, brush gently, protect. Stains on an X fabric are particularly delicate and usually require a professional with very low-moisture or dry-cleaning methods.

Why fibre composition always takes priority

A label code does not cancel the nature of the fabric. Synthetic microfibre tolerates water; viscose velvet doesn't. Mixed wool can felt with hot water or wrong pH. Untreated silk or linen migrate easily. The manufacturer's label usually shows the composition ('100% polyester', '55% viscose 45% cotton'…): it matters more than a letter.

Missing or unreadable label: what to do

• Don't guess with a strong product.
• Vacuum carefully to remove dry particles.
• If you must act, test a very mild solution (warm water, neutral soap, very low concentration) on a hidden area.
• Wait for full drying, then check colour and absence of halo.
• When in doubt, contact a professional before any stronger treatment.

Common mistakes from too-literal reading

• Reading W as 'I can wet as much as I want' — over-wetting stays risky.
• Reading S as 'any solvent from the cupboard is fine'.
• Reading X as 'nothing can be done' — pros have low-moisture methods.
• Believing WS allows mixing two products at once.
• Trusting the code without checking composition or testing a hidden area.

When to contact a professional

• X label, or missing label on a valuable sofa.
• Set-in stains, urine, blood, coffee, wine, oil.
• Persistent odour despite airing.
• Delicate fabric or dye-sensitive patterns.
• Aftermath of a water leak or a failed prior cleaning.
• Doubt on composition or dye fastness.

We do not use acetone, white spirit, petrol, nail polish remover or bleach on upholstery. Professional cleaning uses fibre-appropriate products and a controlled method.

Summary

W, S, WS and X are useful first hints, but they don't replace attention or experience. Fibre composition, dye fastness, stain age and sofa construction weigh at least as much as the letter on the label. When in doubt — no label, delicate sofa, set-in stain — a professional avoids many bad surprises.