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And here's the same mouthpiece after 30 minutes immersed in white malt vinegar. You can quite clearly see that the scale deposits have gone. What you can also see is that the mouthpiece has taken on a dull greenish hue. This is due to the action of the vinegar on the Ebonite that the mouthpiece is constructed of.
Fill the washing machine up and pour in 2 cups of white vinegar. Let it set for 1 hour, then start the washing machine over again and let it run through a complete cycle. When the machine drains if it still has grime on it, use a sponge and some straight white vinegar and scrub it down really well.