I need help cleaning my porcelain doll collection.

I have a collection of Ashton Drake porcelain bride dolls that got store improperly, and now are extremely dirty. How can I get their dresses back to the clean they were? For example, one is supposed to be white, but her veil is now black! I'm just sick! And it's sewn to her head, so there's no way to detach it!

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