How to clean your Stanley Thermos: '79 Stanley. Use 2 tablespoons of baking soda, some peroxide, add hot water. Watch years of tea accumulation disappear. : r/BuyItForLife
How To Clean A Coffee Thermos: Tips To Remove Stains & Smell
Clean a Travel Mug | How To - YouTube
Amazon.com: Water Bottle Cleaning Tablets & Reservoir Bladder Cleaner Tabs (24 Tablets) | Remove Stains & Odors. Compatible with Hydration Bladders, Hydroflask, Camelbak, YETI, Thermos - Made in USA : Sports & Outdoors