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Phil
That is a sign of relatively high copper content. Unless it is really tarnished, I would leave it alone.
Regards
IL.

I do not generally clean numismatic items such as this but if you like your medals bright and shiny then a sulphuric acid based rust remover works really well. I dilute half half. Bronze is resistant to the corrosive effect of sulphuric acid. 3 or 4 minutes is generally fine.Then soapy water & a soft cloth. Unlike tomato sauce it is unwise to recycle the sulphuric acid through the kids.
ATB
David

Thanks David for reply
I have tried the toothbrush and soap but no luck, so still open to idears thanks for yours
PHILIP

Thanks for that Linneyl
Cheers Phil