To remove zinc I keep a bath of old Pickle2 handy. Soak the parts for about 5-10 minutes in the old Pickle 2. Remove, scrub with a brass brush, then soak for another few minutes in Pickle 2. Then rinse, dry, and finally sandblast. Most of the zinc will be gone before it gets to the sandblasting. The acid will also remove some of the rust.
Also if you heavily contaminate your blasting media with zinc, then you will be dealing with this for a long time. Dump it and replace when in doubt. It's pretty reasonably priced.
That's my 2c. Any other suggestions welcome.
Ken
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