Tablets are biodegradable, chlorine-free, all-natural, and environmentally safe. They're individually packaged, and don't require any additional brushing or scrubbing. Good for use on stainless steel bottles, mugs, hydration reservoirs, coolers, dishes, and hard-to-clean plastic containers and bottles.
Promising review: "I seriously can't believe how well these little tablets work. I had the most disgusting HydroFlask coffee mug — I tried everything. A bottle brush, different kinds of soap, vinegar, EVERYTHING, and there was still a seemingly impenetrable layer of black sludge inside. I let a tablet sit in each of my mugs for an hour or two, and the black sludge rinsed out COMPLETELY, without even scrubbing. They look brand new. What a magical product. No weird smell or taste afterward, either. I liked it so much I used it on another HydroFlask I use primarily to hold my Bloody Mary mix in the fridge. I couldn't put anything else in it because it would always taste like spicy tomato juice. Bottle Bright to the rescue! No residual smell or taste anymore. AMAZING AMAZING AMAZING." —Amazon Customer
Get a pack of 12 from Amazon for $8.