Boiling is important for two reasons. First, you will want to boil to ensure parts are thoroughly sanitized. Second, the boiling process makes the parts airtight so they won't leak.             


  1. Drop 3 hard cup parts into 2 large uncovered boiling pots of water.
  2. Boil for 10 minutes while stirring constantly. 
  3. Remove parts with a non-metal spoon and let cool completely.
  4. After boiling, wash all cup parts in hot soapy water, rinse well, and let dry completely before assembling for first use. 

All milk-contacting parts above should be cleaned immediately after each use.