“It's not bad, and really the only thing I've found that actually can get in and clean the glass bottles...but it doesn't clean the very bottom well nor the top where it curves so it's a struggle and I end up using the bottle more for plain water than with a drop, which sucks.”
“This brush is great -- gets the bottles much cleaner than the cheap brush I tried first. Only complaint is that the handle could be longer for easier cleaning of the larger bottles, but otherwise very happy about this brush!”
