The Best Detergent for Washing Silk

Silk has a pH of 4.5 to 5.5, close to human skin, and most laundry detergents sit well above that, formulated with enzymes and brighteners built for cotton and synthetics. Those enzymes are the actual problem: they're designed to break down protein-based stains, and silk is itself a protein fibre, so an enzyme detergent doesn't just clean silk, it slowly degrades it. That's the one fact worth knowing before you buy anything.

What to check on the label

• No enzymes. Often listed as protease, amylase or lipase. This is the single most important thing to rule out.
• A neutral pH, stated as such. Look for "pH-neutral" or a stated range around 5. A detergent that doesn't say either way probably hasn't been formulated for protein fibres.
• No bleach or optical brighteners. Both attack the fibre and the colour over repeated washes, even in small amounts.
• Low or no fragrance if you have sensitive skin, since silk sits directly against it for hours at a time.

A dedicated silk or wool wash is the reliable shortcut, since both are protein fibres with the same requirements. A fragrance-free baby shampoo works in a pinch and meets the same criteria, which is why it's a common substitute when nothing silk-specific is on hand.

Hand washing, step by step

1. Fill a basin with cool or lukewarm water, never hot.
2. Add a small amount of silk-specific detergent and mix it through the water before adding the fabric.
3. Submerge the silk and swirl gently for a minute or two. Don't scrub, wring or twist it.
4. Rinse in fresh cool water until the water runs clear.
5. Press out excess water in a towel rather than wringing, then lay flat to dry away from direct sun or heat.

Machine washing, if you'd rather

Silk survives a machine better than its reputation suggests, on a cold, delicate cycle with a silk-specific detergent. What it doesn't survive is contact with zips, hooks or an agitator drum, which is where most machine damage actually happens. A mesh washing bag solves this: it keeps the piece contained and separate from anything with an edge, while still letting water and detergent through.

What to avoid, every time

• Fabric softener. Silk doesn't need it, and it leaves a residue that dulls the fibre.
• Chlorine bleach, on white or coloured silk alike.
• The dryer. Heat is what actually ages silk fastest; air dry flat instead.
• Direct sun while drying, which fades colour over time.

Common questions

Can I wash silk pillowcases the same way as other silk items?

Yes. The same cool-water, pH-neutral routine applies to pillowcases, masks, scrunchies and any other silk accessory.

Can I use white vinegar when washing silk?

A small amount in the rinse water is a common trick for cutting residue and keeping the fibre soft, as long as it's rinsed through thoroughly afterward so no smell lingers.

Do I need to wash silk after every wear?

No. Silk resists odour and staining better than most fabrics, so washing it only when it's actually visibly soiled, rather than on a fixed schedule, is enough.

The Silk Washing Bag is a fine mesh bag, 60 by 70 by 9 cm, built to keep silk away from zips and hooks on a machine cycle. It fits a pillowcase or several masks at once.