1.) Add vinegar to the Jet Dry compartment of your dishwasher prior to a washing cycle.
2.) Place a small dish filled with lemon juice, vinegar or baking soda on the top track. A few tablespoons of each ingredient should suffice, but you may want to adjust the amount depending on the hardness of your water.
3.) Mix a few teaspoons of baking soda or Borax with your regular dishwashing detergent to prevent future lime buildup.