Why silk is different
Silk is a fine protein fibre, prized for its sheen, and it loses its strength when it is wet. Plain water can leave a permanent ring, the dyes can run, and rubbing crushes the fibre and kills the lustre. Viscose, sold as "art silk", behaves the same way and is even more fragile. This is why nothing you do to a wool rug is safe on silk.
Day-to-day care
Keep a silk rug in a low-traffic spot, out of direct sun, which fades it faster than anything. Vacuum gently with suction only and the beater bar off, or use the upholstery nozzle, and rotate the rug so it wears and fades evenly. That gentle, dry upkeep is the whole of safe home care for silk.
If something spills
Act fast and do almost nothing. Blot the spill straight up with a dry white cloth, pressing gently — do not rub, and do not add water or any cleaner, which can spread the stain and bleed the dye. Lift what you can, then get the rug to a professional quickly; on silk, the safest hands are not your own.
Why it is a professional job
A silk rug is cleaned at a plant that tests the dyes, cleans with low moisture rather than an immersion wash, and dries it flat under careful control. That controlled process is the only way to clean silk without browning it, bleeding the colours or flattening the pile — none of which a home clean or a carpet machine can manage.
What silk rug cleaning costs in NYC
Silk and viscose are the most expensive rugs to clean in New York, about $6 to $12 per square foot, because the work is slow, careful and high-risk hand cleaning. It is dear, but far cheaper than the alternative: a silk rug ruined by a home wash cannot be put right.