Marty,
FYI
Silk is used in more expensive upholstery fabrics and older period furniture pieces.
It is commonly used for moire, matelasse, brocatelle, and damask fabrics.
Some silk fabrics can be wet cleaned with caution, but more often they are dry cleaned. If wet cleaned, use mild solutions and beware of water spotting or water marks. Silk fabric becomes weaker when wet, tend to waterspot if not specially finished, and in some constructions silk fabrics have low abrasion resistance.
Ron, some can be wet cleaned, some you are better not too. I quote it like this, and after a real on site inspection (not just a photo), I may determine it to be safely wet cleanable...but to be on the safe side I will always quote on the side of caution.
P.S. Some of us have great success removing soil with dry solvent type cleaners when they are used properly on a variety of fabrics.