I usually use the tape I've already just removed. If you dab it with the sticky side and pull straight up the tape will eventually pull the residual adhesive off the other surface. As you've probably binned that tape a piece of gaffa tape would work just as well.
I would suggest heating it with a hair dryer, and then using something with a sharp edge that is soft enough not to scratch the metal, e.g. some cardboard, to scrape it off.
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