Antique Silver Shop

http://www.booksofthebible.com/stock/p4567d.jpg

And somehow the polished silver seems to be fading away. It wasnt like this yesterday. Since i was working in a coffee shop, steaming milk and such, is it possible that the steam somehow affected it? Or is there some other reason for it?

Also, if you know any way, or product, i can use to bring that polished silvery shine back to it, i’d really appreciate it.