Just seen this, hope it helps.
Q. Can anyone help me get a chocolate spot out of my cashmere sweater?
A. Chocolate can oxidize any fabric to cause a permanent stain. Cashmere wool is best sent to a professional cleaner for spotting and cleaning. While enzyme cleaners are often recommended for chocolate stains on fabrics, enzymes should not be used on wool. A solvent cleaner such as rubbing alcohol, denatured alcohol, or dry cleaning fluid can be used for spot cleaning wool. Test first in an inconspicuous place for ill effects. Do not use bleach on wool or hot water.
Read more:
http://www.doityourself.com/stry/qnacleaning6#.U0RC-5fQf-c#ixzz2yK0pLWA9