These tablets put in all the elbow grease so you don’t have to. No scrubbing, stirring, or washing; simply drop them in your bottle with some water, and *poof* — all the bacteria and grime are gone. They’re also biodegradable, chlorine-free, and environmentally safe.

Promising review: “This stuff is unbelievable! I’ve used my coffee thermos just about every weekday for around a year now, drinking black coffee, so my thermos was basically black. I figured this stuff would make it, like, a thinner black, maybe cut it to brown, but after soaking for just a couple of hours, my thermos was shiny and silver again, like brand new. I am still in awe at how well it worked. Cheap, too, especially assuming that I’ll only have to use it maybe once a month to keep it clean. I will be recommending it to everyone at the office.” —Brandon Bogert

Price: $7.99 for a pack of 12