I remove plating from screws, washers, etc. with Tidy-Bowl toilet cleaner. Pour a little in a plastic cup, throw the plated parts in, wait about 5 minutes, fish the parts out and rinse well with water.-Ron
Cider Vinegar, aka ascetic acid, will remove zinc very nicely, with no fumes or dust. Just don't use the vinegar in your switzel afterwards...Doesn't even take very long: a couple hours at most.