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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.
2. Fill the sink with 1 inch of hot water -- enough to completely cover a layer of cutlery. Pour in 1 tablespoon of baking soda, swishing it around to dissolve the powder. Add the cutlery to the baking-soda soak and allow them to sit for 10 or 15 minutes.. Pour a small amount of white vinegar onto a nonabrasive white cloth. Wipe down the cutlery with the cloth to remove general stains and marks such as white hard-water deposits.