I run into this often with my little ones. I just soak the item in a small bowl of oxyclean and hot water, it usually will take a day or two of soaking...but it gets every bit of mold out!
I've had some luck with this spray Shout on the spot, make a paste of oxyclean (generic works fine) put that on the spot, then spray some more shout and let sit overnight. Throw it in the wash in the morning (I have had this eat through fabric when left on too long) Good luck
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