This came form the Green Star web site for removing stains etc.
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Stain Zapper - Colored stains and mineral deposits on parts may arise from normal usage of our juicers. To remove color stains and mineral deposits, try the following.
Ingredients:
4 tablespoon of Baking Soda
2 cups (16 oz) of lukewarm water
Soak the parts in the solution of water and baking soda overnight to loosen the mineral deposit, and to remove the colored stains. Wash with soap and water, and use a hard bristled brush to remove mineral deposit. Wipe with cloth to dry.