How to Wash Silk Without Ruining It

The first thing most people do wrong with silk happens before any water is involved. They reach for the detergent under the sink — the one that promises to lift grass, wine and week-old curry — and they measure out a capful. That detergent almost certainly contains enzymes. Enzymes are designed to break down protein. And silk is protein.

That single fact explains most ruined silk. Mulberry silk is fibroin, a protein filament the silkworm spins in one continuous thread — chemically closer to your own hair than to a cotton shirt. Treat it like cotton and it stiffens, dulls and thins. Treat it the way Suzhou weavers have for two thousand years, and the same piece stays supple for years. This guide covers how to wash, dry, iron and store mulberry silk, and what to do when something spills.

The short version

If you read nothing else: cool water, a pH-neutral detergent with no enzymes and no bleach, no fabric softener, never the dryer, and out of direct sun. Everything below is detail on those five points.

Hand washing, step by step

Hand washing is not fussier than machine washing — it is faster, because you skip the mesh bag and the cycle selection. Ten minutes, start to finish.

1. Cool water. Under 30°C / 86°F. Cool to the touch, never warm. Heat is what relaxes the protein structure and lets the fabric lose its body.

2. A detergent made for silk or wool — pH-neutral, enzyme-free. If you do not have one, a small amount of clear baby shampoo works, because it is formulated for a protein fibre. Avoid anything labelled bio, enzyme, stain-lifting or brightening.

3. Move it gently, and do not soak. Swirl for two or three minutes. Long soaking is where dye migrates — that pale piping on a dark set is exactly where it shows up first.

4. Rinse until the water runs clear. Detergent left in the weave is what makes silk feel papery once dry.

5. Never wring. Press the water out with flat hands, then lay the piece on a dry towel, roll the towel up like a swiss roll, and press. The towel takes the water; the fibres keep their shape.

Machine washing, when you would rather

A silk pajama set can go through a machine, provided you make the machine behave. Put the piece in a mesh laundry bag so it cannot wrap around anything. Choose the delicate or silk cycle, cold, with the lowest spin your machine offers. Wash silk with silk — never in a load with towels, denim or anything with a zip or hook.

Two things a machine cannot forgive: a hot wash, and a fast spin. Both are permanent.

What ruins silk

Enzyme detergent. Covered above, and worth repeating because it is the most common cause and the least known. The enzymes do not distinguish between the stain and the fabric.

Bleach — including oxygen bleach. Chlorine bleach destroys the fibre outright. Oxygen bleach, the "colour-safe" kind, is slower but does the same thing. Neither belongs near silk.

Fabric softener. Softener works by depositing a film on the fibre. On cotton that reads as softness. On silk it reads as a dull, slightly greasy hand — it removes the exact glide you paid for. Silk does not need softening; it is already soft.

The dryer. Heat plus tumbling. Even a low setting shortens the life of the fabric, and one hot cycle can shrink a piece by enough to change how it hangs.

Direct sunlight. UV light degrades fibroin and fades dye. A silk scarf dried on a sunny balcony will look tired long before one dried indoors. This applies to storage too — the shelf by the window is the wrong shelf.

Antiperspirant and perfume. The aluminium salts in antiperspirant yellow silk over time, and the yellowing sets into the fibre where washing cannot reach it. Alcohol-based perfume can leave a ring. Apply both first, let them dry completely, then dress.

Drying

After the towel roll, lay the piece flat on a fresh dry towel, or drape it over a rack. Do not hang wet silk on a hanger — water is heavy and the shoulders will stretch. Keep it out of direct sun and away from radiators.

Silk dries faster than most people expect. A pillowcase is usually dry in a few hours; a heavier 30 momme robe may take overnight.

Ironing and steaming

Most silk does not need ironing if you smooth it while damp and let it dry flat. When it does, use the silk setting — the lowest on the dial — and press on the reverse side while the fabric is still very slightly damp. A dry iron on dry silk scorches, and scorch on silk is not recoverable.

A steamer held a few inches away, never touching, is gentler than an iron and faster for a robe or a long scarf. Do not spray water onto dry silk to dampen it — droplets can leave rings. If you need it damp, dampen the whole panel evenly.

Storing

Fold, do not hang. Hanging stretches silk over months, especially anything with weight to it. Store folded in a drawer or a breathable cotton bag — the bag a piece arrived in is designed for this.

Avoid plastic. It traps moisture against the fibre and can yellow it. Keep mothballs and raw cedar from touching silk directly; if you use them, keep them elsewhere in the drawer.

How often, by piece

Pillowcases — every one to two weeks. The side against your face collects skincare oils and hair product, and those are what dull the surface. If you use retinol or heavy night creams, wash weekly.

Pajamas and robes — after two or three wears, or after one warm night. Silk is breathable and does not hold odour the way synthetics do, so it needs washing less often than people assume.

Scarves — rarely. Air them out after wearing and spot clean when needed. A printed scarf that is washed constantly will lose depth in the colours long before it wears out.

Eye masks — more often than the rest, because they sit against skincare and, sometimes, mascara. Weekly is reasonable.

Scrunchies — every few weeks, by hand, and lay flat to dry so the elastic keeps its tension.

Stains

The rule for all of them: blot, never rub. Rubbing pushes the stain into the weave and abrades the surface, leaving a dull patch that stays visible after the stain is gone.

Fresh spills — press with a clean white cloth to lift as much liquid as possible, then hand wash the whole piece rather than spot-treating one area. Spot treatment on silk often leaves a water ring worse than the original mark.

Oil and makeup — cover the mark with cornstarch or talc and leave it for an hour. The powder draws the oil out. Brush it off, then wash.

Underarm yellowing — this is usually antiperspirant, not sweat. A rinse in cool water with a splash of white vinegar can lift early marks. Set-in yellowing generally cannot be reversed, which is why the "apply, dry, then dress" habit matters more than any stain remedy.

Anything you are unsure about — a specialist dry cleaner who handles silk regularly. Tell them it is mulberry silk.

Does momme weight change the care?

Not the method, only the timing. A 16 momme scarf dries in an hour; a 30 momme robe takes overnight and holds more water, so the towel roll matters more. Heavier silk is also more forgiving of handling — but no silk is forgiving of heat. If you are choosing between weights, our guide to momme weight covers what each one is for.

A note on what this protects

Silk is the strongest natural fibre spun into thread, and a well-kept piece outlasts almost anything else in a wardrobe. Nearly every silk garment that fails does so from heat, enzymes or sunlight — never from being worn. The care above is not delicate treatment for a delicate thing. It is the correct treatment for a durable one.

Every SuuSilk order arrives with its care instructions. If you are unsure about a specific piece, email support@suusilk.com and we will tell you exactly how to handle it.