Chemical smell in fursuit head

Hey all. Instead of asking about a head I'm making, I'm asking for a friend's head this time.

My friend bought a premade fursuit head. Resin cast, airbrushed, silicone tongue and nose, taxidermy style teeth, and resin eyes. She told me of a weird "chemical" smell that she doesn't quite know how to describe that she can't figure out how to remove from the head. She doesn't know what the smell is from and she's afraid to wear it for too long in case it's harmful.

Any methods to remove the smell? Or at least what the smell could be from.