Cashmere of such delicacy requires special attention, it must be handled with care.
Dry cleaning with a professional using eco-friendly products is recommanded.
The shawl can also be washed  by hand as water. Just follow certain precautions.
Dilute some natural soap or baby shampoo in cold water.
Do not soak it. Stir gently the shawl for a few minutes.
Do not us fabric softener, few drops of white vinegar can be added.
Spin gently the stole without twisting it and dry it flat avoiding sunlight.
Iron at low temperature.