How to clean the inside of the contigo lids? There is build up of tea/coffee on the inside. Soaking with soap and/or vinegar leaves a funny taste : r/howto
Contigo Byron 2.0 20oz Stainless Steel Travel Mug With Snapseal Lid And Grip Gunmetal : Target
Amazon.com: Contigo West Loop Stainless Steel Vacuum-Insulated Travel Mug with Spill-Proof Lid, Keeps Drinks Hot up to 5 Hours and Cold up to 12 Hours, 24oz Steel : Home & Kitchen