I've removed such coatings in two ways. Firstly, by submerging the badge in very hot water and leaving it there for several minutes. You may need to repeat several times using a fairly stiff brush after each occasion. The coating will peel with the heat and will flake off. Another way is to use steam to achieve the same result. Holding the badge with pliers in the steam of a boiling kettle is a practical way of doing it.
Dave.
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