Cleaning Zinc Plating HELP!!!!

[Blackvette]

I had my Brake Rotors and Caliper Brackets Zinc Plated last year. I stupidly used one of those caustic brake dust cleaners and it dulled the Zinc to a flat gray color...

Is there a chemical treatment I can use to bring the shine back? Like TarnX or something?

So far I am trying NeverDull Wadding and it messy and time consuming...

I really don't want to have to have them replated all over again..