My guess? Immerse in cool/cold water, rinse gently, and allow to air-dry. That should prevent matting or shrinking of the fibers, and get the milk out.
So, I don't know if it's still relevant, but my friend said that she doesn't do much cotton (mostly wool, I think), so she's not sure. However, she suggested asking at handspinning, which she's a member of. Hope you figure it out!
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