Keyfit Tools BrushBalls (4 pk X2) 8 Total Water Bottle Cleaning Brush Balls Reusable For Sports Drinks & Protein Shakes Cycling Fitness Sports Gym Hiking & Coffee Thermos

These cleaning products work well in any water bottle. Just add a little liquid soap and half bottle of water. Shake it rinse and repeat a few times. Let your bottle air dry. Then your good to go.

This is a good concept - but if they were heavier they might be more effective. I tried using them for a smoothie caraffe and they were fairly ineffective. Also, the little nubs on them started wearing off after a week of occasional use.And caution - these can easily slip through your fingers or be hidden in soapy water and go right into your disposal.Would not buy again, unless they were heavier & maybe larger.

I wanted something like this to work but these aren't it. They are so light-weight that they don't really clean or scrub anything. Get a bottle brush. A brush is a bit of a pain to use but it get's the job done; these don't.