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These things are a game changer for my protein shaker—the little beads swish right into the grooves under the lid that my brush always missed. After one spin with soapy water, the whole bottle feels squeaky clean, and I don't dread washing it anymore.

I was skeptical that tiny beads could outdo a brush, but these really do slide into the curve at the bottom of my thermos where gunk always hid. Just a swirl with soapy water and every last bit of residue comes loose. The no-scratch cleaning is a bonus for my glass carafe.

I was skeptical about these beads getting into my Hydro Flask's narrow neck, but they sink right in and swirl around the base where I can never reach. The sink looks gross after each use, yet these pick up all the grime that my brush leaves behind.