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Put it in a jar of white vinegar for 30 minutes...
Brush with a brass wire brush...
... and get a clean base.
When in the vinegar, bubbles will form on the surface of the zamac as the corrosion is eaten up, in severe cases, leaving a scummy film covering it when removed from the vinegar.
... and vinegar is safe enouth to put on your food!
.... I have been putting mine in acid and come back 10 mins later and its gone 
..... Great tip 
