I am doing research on stain removal and I found a website that suggests boiling water on the stove in a large pot, adding 3/4 - 1 cup of biz, and adding your stained clothes. Let simmer about 45 minutes. Apparently there are people writing and saying it has removed ink stains, and even nail polish. You could try it.
Often I have very good luck at removing transferred color stains just by rewashing the garment (in warm water?) with a liquid laundry detergent containing "bleaching action". (Ex: Detergent XYZ with BLEACH.) Not liquid bleach that you add separately. But, that would be my next try depending on the fabric.
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