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Tossing a couple of these into my water bottles after a hike makes cleaning ridiculously easy—the ceramic ball really gets into the crevices without me having to scrub.

I was skeptical a ceramic ball could really scrub, but these little sponges got every last bit of dried tea out of my tumbler. Shaking it with soap and water actually worked better than any bottle brush I've tried.

The ceramic ball inside really gets the gunk off the bottom of my narrow water bottles that I could never reach with a brush. After a good shake with soap and water, they come out sparkling clean with no effort.