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.
• Delicate cycle or hand wash at a maximum of 30 °C (86 °F).
• 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.
• Spin on low (400 to 600 rpm) only if the label allows spinning.
• No tumble dryer, no bleach, no fabric softener.
• Dry flat or hanging, away from direct sun and radiators.

The right detergent: where most silk gets ruined

Silk is a protein fibre. Like hair, it's built from protein, and that's exactly where the most common washing mistake happens. Most heavy-duty and universal detergents contain enzymes, among them proteases, which are added to break down protein stains. Proteases can't tell the difference between a stain and the silk fibre itself. Wash after wash, they wear the fabric down until it loses its sheen and its smooth feel.

So use a protease-free delicate detergent or a dedicated silk detergent. Two more things stay out of the wash: bleach, which weakens the fibre and fades colour, and fabric softener, which settles on silk as a film and changes its natural touch.

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 at a maximum of 30 °C. Many machines have a dedicated silk programme, which usually reduces the mechanical strain.

Reduce the spin. Spin only if the care label allows it, and then at a low speed of 400 to 600 rpm. A hard spin pulls the wet fabric out of shape.

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, no warmer than 30 °C, and dissolve a small amount of protease-free detergent. 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.

How to dry silk

Silk goes in the tumble dryer only if the care label explicitly allows it. The heat can damage the protein fibre permanently. When in doubt, let the pillowcase air dry, flat on a drying rack or on a hanger.

Avoid two things while it dries: direct sun, which fades colours and yellows white silk, and radiators, whose dry heat makes the fibre brittle. Silk dries quickly anyway; a pillowcase is usually dry within a few hours.

Ironing and steaming

Silk wrinkles. That's the nature of the material, not a defect, and most creases fall out on their own while it dries. If the care label allows ironing, iron the pillowcase slightly damp, inside out, on the lowest setting (the silk setting). A handheld steamer works too, held at a distance. Steam can leave water spots on silk, so 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.

Where silk is genuinely demanding

Silk forgives many things, but not heat, enzymes, or rough handling. If you want bedding you can throw in a 60-degree wash with the towels and tumble dry hot, silk isn't the right material for you. What silk asks for isn't complicated; it's consistency: cool water, the right detergent, gentle drying. Held to that, washing silk takes no more effort than a normal load of delicates.

RENESSY silk pillowcases are made from 100% organic mulberry silk in 22 momme, Grade 6A, GOTS certified, carrying the OEKO-TEX MADE IN GREEN label, and dermatologically tested and certified by Dermatest (5-Star and Sensitive Skin seals). Each one comes in a gift box with a care card that covers the steps in this guide. You'll find all sizes and colours in our silk pillowcase collection.

Frequently asked questions

How do you wash a silk pillowcase?

Close the zip, turn it inside out, and wash it in a mesh bag on the delicate or silk cycle at a maximum of 30 °C with a protease-free detergent. Hand washing in lukewarm water works just as well. Then let it air dry.

Can you wash silk in the washing machine?

Yes, if the care label marks it as washable. Use the delicate or silk cycle at a maximum of 30 °C, a mesh laundry bag, and a protease-free detergent, and, if the label allows spinning, keep the spin at 400 to 600 rpm.

What detergent is safe for silk?

A protease-free delicate detergent or a dedicated silk detergent. Heavy-duty detergents contain protein-splitting enzymes that attack the fibre, and bleach and fabric softener don't belong in a silk wash either.

Can you put silk in the dryer?

Only if the care label explicitly allows it. For most silk the answer is no: the heat damages the protein fibre. Air drying away from sun and radiators is the safe route, and silk dries fast on its own.