Dawn dish liquid works and probably most other dish liquids would, but use them very sparingly as they make a lot of suds in a washing machine. I would suggest she use hot water, start the wash cycle to get the soapy water well worked through them, and then let the things soak for 10-15 minutes before starting the wash cycle again. It may take another cycle to get the soap out but the odor should be gone. Good luck.
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