“The bottle brush is supposedly designed for Waterdrop specific bottles. However, I had a very hard time getting the brush into my 34 oz bottle. I felt like I was breaking the brush as I forced it through the small opening. The brush is also not long enough to reach the bottom of the bottle, making it difficult to clean the bottom. Would not recommend purchasing this. You will be better off buying something cheaper that will actually work.”
“The handle isn't long enough for the tall bottles and it can't clean the shoulder area inside the bottle. I recommend that you look at the SIGG bottle brush. It works much, much better.”
“Nice brush but not designed well to clean the bottles. I could hardly get it through the opening without bending the brush in and pushing really hard. The brush should be more flexible so you can clean the top of the inside of the bottle as well. The bristles hardly reach that area.”