How do I clean necklaces? Or how do I clean the chain and the pendants for it to be clean?

okay so yeah how do I clean the chain or pendant of the necklace or both? The wolf looks really old, and the chain is rusted sort of…..But here’s a link of what it looks like. I’m only assuming it will help.

http://www.amazon.com/Final-Fantasy-VII-Children-Necklace/dp/B001ALZHN8

Thanks guys!