You want to know how to remove the gold plating from the Nissan emblem on your
keys? Never had this problem before, as my keys didn't have any shiny on them, just black plastic, but the method I've seen when removing brand names from cell phones is to mix some fine grain sugar (not powdered) with a bit of water to make a slurry and then apply with a toothbrush, this mix should be abrasive enough to remove the plating.