Brown Mineral Buildup How To Remove Mineral Buildup On A Silver Ring?

How to remove mineral buildup on a silver ring? - brown mineral buildup

I have a silver ring my friend gave me. So I on my birthday in a natural hot springs is included, I forgot to take my first band, and was in the water for about 20 seconds! I thought it would be good but now its starting point to a dirty brown in it. I know that your real money, so there is something I can do to get there?