Reusable water bottles are handy and a great money savey, but even with the help of soapy water and a bottle brush, they can be difficult to clean. When you're finished with the brush, fill your reusable bottle with water and pop in a couple of denture cleaning tablets. Let it sit overnight, and the bottle will be as good as new.
Photo by HG
You'll still want to follow up with a narrow bottle brush after you come back to your bottle in the morning, just to get the dregs out. Overnight, the effervescence and cleaning power of the tablets will dislodge things like mineral buildup or mildew.
You can use this same trick for tea kettles and coffee pots, wine bottles or drink jugs -- anything you need to clean that has a small opening that makes it tough to get in there.
Quick Tip #12: How to Clean and Sanitize Reusable Water Bottles [Apartment Therapy]