How to Keep Your ThermoFlask Bottles Clean


Mar 15, 2023

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How to Keep Your ThermoFlask Bottles Clean


Cleaning your bottle every day keeps your ThermoFlask bottle fresh and adventure-ready. After thousands of washes, we have some tips to share:

Easy as 1-2-3: Keeping Your Bottle Clean.

Your bottle is made to use again and again, so we’re including a few tips on keeping it squeaky clean for the best drinking experience.

  1. Daily Brush Washing by Hand: Use the large end of our handy 2-in-1 Bottle Brush and wash with warm water and soap. Scrub the entire bottle. Then use the smaller straw brush to clean the straw or spout components. Leave your bottle to dry overnight and make sure to leave your spout or straw lid open when drying. In the morning, simply reassemble and add your favorite beverage.
  2. Dishwasher: Place lid in the top rack, bottle base in bottom of the rack, make sure spout and straw lid are open. Use occasionally for a deep clean.
  3. O-Ring Deep Clean: The O-rings are the silicone rings in the lid of your bottle that help form a tight, leak-proof seal. Spout bottles have two O-rings and straw bottles have one. Remove the O-rings then soak overnight in a 50/50 solution of warm water and vinegar. Rinse and let them fully dry before placing them back in the bottle to avoid trapping any water in the lid. We recommend letting them dry on a paper towel for several hours. The O-rings create an airtight seal to lock in the cold, so make sure they’re in right.


Want a step-by-step video on how to make your bottle shine? 

Cleaning Video Guides

If any bottle parts are worn or weathered, check out for replacement parts.