Wool and Cashmere
Hand these babies to the dry cleaner. They're very delicate and are not made for machine or hand washing.
These shouldn't be dry cleaned because dry cleaning solvents can often degrade synthetic fabrics. You can hand or machine wash these or even find a professional service that handles synthetic fabrics.
Sheer curtainsSheer curtains need to be cleaned often because you run the risk of experiencing discoloration if too much time passes in between cleanings. Sheer fabric is delicate and so should be soaked in cold water with a mild detergent. You can use a machine, but only with the gentlest cycle. Likewise, you can use a dryer but with no heat and an added soft terry cloth towel to help soak up the moisture.
If you are choosing to wash your drapes, a good safety precaution to take is to take a small hidden section of the drapery and dip it in a bowl of warm water and detergent to see if the color bleeds. If it does, or if the material seems to be damaged, then it is best to take it to the dry cleaner instead.