How to get rid of chemical smell on small plastic toy figures made in china?

sold by sue rider charity shop, I was told they were tested for safety. The smell is very strong and affect the room in which they are kept. The fairy tale figures are perfect for my sand tray and my granson also loves them.
Update: I have soak them in soapy water overnight, in lavender oil and water, and sprayed them with fixative. I am wondering about a kind of transparent spray which could act as a barrier.
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