My son is on the autism spectrum and we used cilantro and chlorella to detoxify him some. He was 4 when we started this, after a couple of weeks, he started talking again, little by little.
Cilantro, from what I read, loosens the stuff, and chlorella cleans it up and sweeps it out.
I don't know if that'd work with graphene but it's probably worth a shot IMO.