How do I remove the yellow from chemically straightened grey hair?

My hair is about 75% grey and the white is naturally silver with a blue cast, which is nice. But I chemically straightened my hair, which turned out well, but now all the white in my hair has a yellow/green cast. Is there any way to actually REMOVE this discoloration and get my natural color back??How do I remove the yellow from chemically straightened grey hair?
You can try a purple shampoo that you can pick up at a beauty supply store. I'm pretty sure the name of it is Shimmering Lights but someone in the store should be able to point you to it. The purple in the shampoo cancels out the yellow.How do I remove the yellow from chemically straightened grey hair?
You could try swim shampoo and conditioner for removing chlorine. Blond hair responds to this and can tinge green after treatment and swimming. Give it a go! Also seek advice so it does not happen again, maybe through a good hairdresser.