Simply drop a tablet in the sink, allow it to sit for between 15 and 30 minutes, then rinse with water.Promising review: "I can't believe how these little tablets work. HydroFlask coffee cups were the worst I have ever used. I tried everything: vinegar, bottle brush, soaps, shampoos, etc. But the black sludge remained. I was so disgusted by it that I purchased another HydroFlask to replace the one that had become damaged. They both turned black, so I bought these magic tablets. After letting a tablet in each mug for a while, the black sludge was completely rinsed out of them. They look like new. It is a truly magical product. There was no weird taste or smell afterward. It was so good that I put it on another HydroFlask, which I use to store my Bloody Mary mix in the refrigerator. It tasted like spicy tomato juice, so I couldn't add anything to it. Bottle Bright, your rescue! There is no residual taste or smell. Amazing, amazing, and incredible. Amazon CustomerAmazon offers a 12-pack for $8.Learn more about the reasons these tablets are so beloved by people!
