We recommend cleaning your food jar and lid after each day of use to ensure it remains mold and germ free.  The food jar is dishwasher safe. For a deep cleaning, remove the lid's O-Rings and soak in a 50/50 solution of water and vinegar until you can wipe clean and then rinse with fresh water. (Do not use cleansers with harsh chemicals like bleach or chlorine as they can ruin your bottle.) When reassembling, ensure the jar, lid and O-ring are thoroughly dry. Check your lid to make sure the O-ring is in place. The O-Rings will create the airtight seal to prevent leaks and ensure proper insulation.