I found this info here: http://de.essortment.com/stainsclothes_ryij.htm
To remove stains from silk, add 1/2 cup of mild detergent and two teaspoons
of white vinegar to two quarts of cold water. Do not soak the material in
this solution. Rinse well and then roll the garment in a towel and iron
while it is still damp.
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