Zinc is a relatively new problem(5-6 years) and there is no absolutely fool proof method of keeping it out. That is however, the best approach.
As to getting it out after contamination occurs, I think the jury is still out. I've read, and reread what has been discussed here. It seems as if several have tried with different degrees of success. Those with chemical backgrounds say it will work. Skeptics like me are waiting for the unfortunate event to need it.
Probably, I'd take mine to the scrap yard, with it marked as such.