![Bottle of the Isotonic energy drink with brown liquid covered by dew. Sport beverage isolated on white background. Stock Photo | Adobe Stock Bottle of the Isotonic energy drink with brown liquid covered by dew. Sport beverage isolated on white background. Stock Photo | Adobe Stock](https://as2.ftcdn.net/v2/jpg/04/54/54/81/1000_F_454548159_NRsneHwFgxgTtj3blyDovXhABL2eKTcp.jpg)
Bottle of the Isotonic energy drink with brown liquid covered by dew. Sport beverage isolated on white background. Stock Photo | Adobe Stock
![What is causing the small brown discoloration at the bottom? I only use the bottle for filtered water. : r/Hydroflask What is causing the small brown discoloration at the bottom? I only use the bottle for filtered water. : r/Hydroflask](https://preview.redd.it/zneekddjuwq71.jpg?auto=webp&s=8bf9d52627c0c3b0277916013b87b895167c115c)
What is causing the small brown discoloration at the bottom? I only use the bottle for filtered water. : r/Hydroflask
![Any ideas how to clean brown stuff off the inside of my bottles? I have found that shaking with salt & water can get it off a little, but curious if anyone Any ideas how to clean brown stuff off the inside of my bottles? I have found that shaking with salt & water can get it off a little, but curious if anyone](https://preview.redd.it/any-ideas-how-to-clean-brown-stuff-off-the-inside-of-my-v0-v3an36azhwv81.jpg?width=640&crop=smart&auto=webp&s=252b8b9584d97387f3c362bb175655492ba67923)
Any ideas how to clean brown stuff off the inside of my bottles? I have found that shaking with salt & water can get it off a little, but curious if anyone
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