- Before first use, wash the flasks with warm soapy water and rinse thoroughly.
- For hot beverages, preheat the flask by filling it with hot water for a few minutes before pouring in your drink.
- For cold beverages, chill the flask in the refrigerator before use.
- To clean, hand wash the flasks with a non-abrasive sponge and mild detergent. Do not use bleach or abrasive cleaners.
- Avoid dropping or denting the flasks to maintain their insulation properties.