How to Wash Silk: Machine and Hand Washing, Step by Step

Silk is easier to look after than its reputation suggests. Most damage doesn't happen while you sleep; it happens in the wash, where one hot cycle or the wrong detergent can change the fabric for good. The good news: silk that's labelled washable can be cleaned at home with a few ground rules, often in the machine. Your care label always takes priority. This guide walks through every step for washable mulberry silk, the kind used in most silk pillowcases.

The quick answer

• Check the care label first. It overrides everything in this guide.
• Washing method and temperature follow the tub symbol on the label; a hand-wash symbol permits hand washing only.
• Use a protease-free delicate or silk detergent, never a heavy-duty one.
• Close the zip, turn the item inside out, and use a mesh laundry bag.
• Wash process as the bars under the tub symbol set it: no bar normal, one bar mild, two bars very mild.
• Tumble drying and bleaching only where their own symbols allow them. No fabric softener.
• Dry the way the label's drying symbol shows, away from direct sun and radiators.

What temperature does silk need?

The maximum sits on the care label, and nowhere else. The fibre name doesn't set a temperature: two fabrics made from the same fibre can carry different instructions, because finishing, dyeing and construction all have a say. If the label gives a washing temperature, that is your ceiling. If it gives none, the other symbols answer the prior question first: a hand-wash symbol permits hand washing only, and a crossed-out tub rules washing out altogether. A tub without a figure does not mean the temperature is yours to pick. Follow the symbol and wash as cool as you can.

One thing that often gets misread is fabric weight. The figure quoted in momme describes how heavy a silk fabric is for its area, and 19 to 25 momme is the usual trade range for pillowcases. It tells you nothing about washing temperature. At 22 momme, just as at any other weight, the label decides.

The right detergent: the choice that matters most

Silk is a protein fibre. Like hair, it's built from protein, and that's exactly where the most common washing mistake happens. Many heavy-duty and universal detergents contain enzymes, among them proteases, which are added to break down protein stains. Proteases aren't indiscriminate, but they can act on accessible peptide bonds in silk fibroin. How much this matters depends on the enzyme, the concentration and the wash conditions. Keeping proteases away from silk is the simple precaution.

So use a protease-free delicate detergent or a dedicated silk detergent. Bleach is governed by the label's bleaching symbol; without that clearance it stays out, because bleach can weaken the fibre and fade colour. Fabric softener stays out either way, since it settles on silk as a film and changes its natural touch.

A practical note on reading the bottle: detergent packaging often declares only the category “enzymes” rather than the individual enzyme, though some brands do name them. Where the specific enzyme isn't named, the word alone tells you little, and the absence of “protease” proves nothing. The manufacturer's full ingredient list, or a detergent explicitly sold for silk and wool, is the more reliable signal.

How to wash silk in the washing machine

Prepare. Close the zip, turn the pillowcase inside out, and put it in a mesh laundry bag. The bag protects it from rubbing against the drum and other textiles.

Choose the programme. Delicate or silk cycle, with the label's temperature as the ceiling. Many machines have a dedicated silk programme, which usually reduces the mechanical strain.

Mind the wash process. The bars under the tub symbol set the washing process: no bar is the normal process, one bar a mild process with reduced agitation, two bars a very mild process with much-reduced agitation. They prescribe no particular spin speed, and how much strain a programme actually puts on the wet fabric also depends on drum action, duration and load. Where the drying symbol calls for drip drying, cancel the spin altogether.

Wash with similar items. Keep silk with lightweight, similar-coloured textiles. Not with jeans, towels, or anything with zips or Velcro.

How to hand wash silk

Fill a basin with lukewarm water and dissolve a small amount of protease-free detergent. Keep it as cool as the wash symbol directs; where it names a figure, that figure is the ceiling. Move the pillowcase gently through the water for three to five minutes. Don't let it soak, don't rub, don't brush. Rinse thoroughly with clear, cool water until no detergent is left.

Don't wring it out. Press the water out gently instead, then lay the pillowcase flat on a towel and roll the towel up to absorb the remaining moisture. Where the label's drying symbol calls for drip drying, skip this step and let it drip instead.

Stains: what you can do at home, and where to stop

A washing guide isn't complete without the thing that sends most people looking for one: a stain. Work conservatively, because repeated rubbing and re-wetting is what dulls the surface.

1. Start early and dry. Blot the excess, don't rub. Rubbing works the stain into the weave and dulls the surface.
2. Test somewhere hidden. Inside face or hem first, with clear cool water and at most a drop of the protease-free detergent.
3. Don't combine remedies. For spot treatment at home: no bleach, no stain salts, no vinegar or lemon home fixes. Silk doesn't behave like cotton.
4. Know the limit. Blood, oil-based make-up and dyes are where home treatment ends, as is any stain over a large area. A cleaner experienced with silk has options you don't have at the sink.

Whether a stain lifts completely can't be known in advance. The point of these steps is to keep one stain from turning into two problems.

How to dry silk

Silk goes in the tumble dryer only if the care label explicitly allows it; without that go-ahead, our advice is to air dry it. Which kind of air drying is intended is on the label too: the symbols distinguish line drying, flat drying and the drip-dry variants of each, any of which may additionally call for drying in the shade, and they aren't interchangeable. Where no drying symbol is given, the fibre name doesn't answer the question either, and the standard sets no default. A hanger has one physical drawback: wet silk fibres are more fragile, and hanging concentrates the weight at a few points. Ask the manufacturer if you need certainty.

Avoid two things while it dries: direct sun, which fades colours and yellows white silk, and a spot on the radiator, since sustained warmth and very dry air speed up the ageing of natural fibres. Silk dries quickly; how long depends on room temperature, humidity and how much water you pressed out.

Ironing and steaming

Silk wrinkles. That's the nature of the material, not a defect, and creases relax as the fabric dries under its own weight. If the care label allows ironing, iron the pillowcase slightly damp, inside out, on the lowest setting (the silk setting).

Steaming is a separate decision and doesn't follow from permission to iron. Care symbols cover ironing temperature and steam separately, and at low ironing temperatures steam can cause damage that doesn't come out. Use a handheld steamer only where the label or the manufacturer clears it, and test it on a hidden area first.

How often should you wash a silk pillowcase?

Like any pillowcase, silk collects skin oils, skincare residue, and dust overnight. Once a week is a sensible rhythm, the same as for cotton bedding. If you use rich overnight skincare or have oily skin, wash a little more often. A second pillowcase to alternate with makes the weekly change easier. A separate guide goes through the silk pillowcase benefits people report, and where the evidence stops.

Where silk is genuinely demanding

Silk asks for attention in three places: temperature, detergent and handling. It asks you to read the label and follow it. If you would rather not think about laundry at all, that is a fair reason to choose a different material. What silk asks for isn't complicated; it's consistency: the temperature the label allows, the right detergent, gentle drying. Held to that, washing silk takes no more effort than a normal load of delicates.

RENESSY silk pillowcases are GOTS certified, carry the OEKO-TEX MADE IN GREEN label, and are dermatologically tested and certified by Dermatest, holding both the 5-Star seal and the Sensitive Skin seal. They are made from 100% organic mulberry silk, 22 momme, Grade 6A, and each one comes in a gift box with a care card. You'll find the current sizes and colours in our silk pillowcase collection.

Frequently asked questions

How do you wash a silk pillowcase?

Read the tub symbol first: it tells you whether machine washing is allowed at all. Where it is, close the zip, turn it inside out, and wash it in a mesh bag on the delicate or silk cycle, staying within the label's temperature, using a protease-free detergent, with the wash process as the bars under the tub set it. Where the tub carries a hand, wash it by hand, which also gives you the most control over mechanical strain. Then dry it the way the label's drying symbol shows.

Can you wash silk in the washing machine?

Only if the tub symbol on the care label carries neither a hand nor a cross. A tub with a hand also marks the silk as washable, but it permits hand washing only. Where machine washing is allowed, use the delicate or silk cycle within the label's temperature, a mesh laundry bag and a protease-free detergent, with the wash process as the bars under the tub set it.

What temperature should silk be washed at?

As warm as the care label allows, and no warmer. If no figure is given, read the other symbols first: they tell you whether the item may be washed at all and whether only by hand. Follow the symbol rather than choosing a figure of your own, and wash as cool as you can. The higher the temperature, the greater the risk of shrinkage and lost sheen.

What detergent is safe for silk?

A protease-free delicate detergent or a dedicated silk detergent. Packaging often names only the category “enzymes”, so check the manufacturer's full ingredient list or choose a detergent sold explicitly for silk and wool. Fabric softener doesn't belong in a silk wash either, and bleach only where the label's bleaching symbol allows it.

Can you put silk in the dryer?

Only if the care label explicitly allows it. The symbols distinguish normal drying, gentle drying and a prohibition; without a go-ahead, our advice is to air dry instead. Heat can damage the protein fibre permanently.