The hole of the milk tube joint is blocked by milk residue, making it difficult to clean.

Reason: The milk tube joint has not been cleaned for a long time.

Solution: Soak the milk tube in warm water for 1 hour, follow the steps of "Cleaning Bottle and Tube" in the "Daily Cleaning Products" section, and continue to use the milk froth function for cleaning until the water is smoothly drained from the coffee spout. You can use a needle or cleaning brush to clean the hole.