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Does anybody have any mouthpiece polishing advice?

I generally wash them with dish soap and warm water, then use whatever silver polish is at hand. (Except for stainless ones; with those I stop after the dish soap.)

Using a little toothpaste does a good job and smells good too.

Got that from Don Butterfield when I was a kid.

I use regular silver polish (Tarni-Shield), and then rinse it off when I am done. Be careful of using abrasives!

Don't forget the inside of the mpc. That's more important than how it looks on the outside.

When my son played T-bone in HS, he took lessons from the late and great Art Sares. At the beginning of every lesson Mr Sares would inspected the inside of his mpc to make sure it was sparkling. He recommended Twinkle silver polish for that.