best method to clean copper artifact

[Moe (fl)]

What is the best way to clean this old spigot?

It is copper/ bronze. It was found at the beach. I tried electrolysis for 3 hrs but didn't do much.

I also tried baking soda. Heard that warm peroxide may help. Any ideas?

Thanks.

 

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[Tom_Restorer]

ONLY with a supra sonic scaler like this or with scalpel when the encrustion is not to big (and be carefull! Do not breath the dust!)