Mix 2-3 Tablespoons of baking soda with a small amount of warm water to form a paste. The paste is a nonabrasive scrub and deodorizer.

Whip out your handy Bottle Brush; this is your most critical tool when waging a odor war! Dip the bristles into your baking soda paste and apply to the affected area. If any debris remains, reapply your Bottle Brush.

Rinse the flask with warm water. Then wash with regular dish detergent. If your flask is experiencing a severe case of odor, the issue may reside with your cap and gasket.

It may be beneficial to give it an extra deep cleanse by placing on the top rack of your dishwasher. Always ensure all portions of the flask are thoroughly dried before storing and/or store with the cap ajar. 

We also suggest trying our Natural Cleaning Tablets to help keep your flask squeaky clean!