Thanks to all those who wrote in with tips on the eggnog stains. Lots of amateur Heloises out there, some with unorthodox cleaning techniques:

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Eggnog stains on silk may be sponged with lukewarm water, then apply glycerine, rubbing lightly between the hands. Let stand for half an hour. Rinse with warm water.

We're, uhm, excited to try this. Of course, sponging with warm water and rubbing down with glycerine is what caused the problem in the first place....