Contigo cups... paint chipping

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So I’ve had one of the handle contigo cups from the first meh sale Contigo handle mugs The paint is chipping off, at first I didn’t mind, but now I’m noticing it’s getting into food when I drink over it (ewww) So I’m looking at stripping it off and trying to give it a brushed look. Anyone had any success for this and want to give me any pointers?