I have a set of silver flatware that is super tarnished. Some pieces have turned gold, some green, and others blue. It's gross. I only use the set maybe twice a year, for holidays, but it's nice. Or it was. Any ideas on what to clean it with to get the grossness off where I can use it again? I've read about a trick with laying it on tinfoil, pouring hot water, baking soda and salt and that supposedly works but I'm open to other suggestions that don't involve chemicals and/or heavy scrubbing.