Always ensure that the caps and its parts are absolutely clean before first use and after every use.? Clean the cap by immersing in warm soapy water for 5 minutes and then rinse with normal water.? For sections of the cap that are difficult to clean, use a blunt edge toothpick to clean any deposited grime.?? Ensure that you don't puncture the sipper cap / straw while cleaning the cap.

?Perfectly fitting bottle cap for Hot Muggs? wide mouth stainless steel bottles