Inside cleaning of a silver plated coffee & tea service- please help!

by Gra12912425
Tried many cleaning solutions but can't get black stain on inside of tea pot and coffee pot. Silver cleaner. lemon juice and baking soda with aluminum foil does not remove this stubborn stain. Not sure if I should use the service with this ugly huge spot. It is inside of sugar and creamer surface also. Not silver plate...almost looks like stainless steel as the metal used. Please help.

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