A "dry clean only" label is a legal safe-harbor as much as it is a warning. A manufacturer only has to provide one care instruction proven safe for a garment — if there's any doubt that a fabric, dye, lining, interfacing, or trim would survive water and agitation, "dry clean only" is the label they can put on it without testing further. It doesn't necessarily mean washing would ruin the garment; it means washing was never guaranteed safe.
Simple, unstructured pieces in stable fibers — many washable silks and some rayons among them — can often survive a careful hand wash: cold water, a small amount of a mild wool-or-silk-safe detergent, gentle squeezing rather than wringing, dried flat away from direct heat or sunlight. This is a choice you're making to trade the manufacturer's guarantee for convenience, not a guarantee itself — always test on a hidden seam first, and when a piece is expensive or sentimental, that's exactly when the professional cleaner is worth it.
See our laundry symbol guide for what the professional-care circle symbols on a label actually specify. See how LaundryMax works.