Grease pencils are my favorite garden markers, too.
I haven't used zinc tags, but I have gotten grease pencil off plastic tags by using an eraser. The ones that work best are the white ones. I have one labeled Magic Eraser, but a regular white eraser works for me as well. These are the kinds of erasers sold in art supply stores. I can get the names completely off if they're a year or two old.
I found a ton of old plant tags when I moved my garden this spring, and it took the white eraser plus scrubbing with one of those green nylon scrubbers sold for kitchen use plus detergent.
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