Imerse the badge in hot water and leave for a period of time. You will find that the coating will begin to flake away. After each immersion scrub with a tootbrush or similar, and repeat. Another method is to hold the badge with a pair of long nosed pliers and use the steam from a boiling kettle to shift the coating. Take particular care if there is any enamelling on the badge as heat may cause it to crack or otherwise dislodged.
I woiuld not recommend the use of any abrasive chemical agent.
Dave.
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