well at first i was using this bottle brush, the one with the suction thing, but then i realized that the bristles at the top tend to flatten out in about 2 to 3 weeks. i change my bottle cleaner every month but i still felt like it wasn't cleaning the bottom of my bottles good enough. so i bought the one with the sponge tip and i love it even more. i thought this one would work better because it is more expensive but i guess i was wrong. if only they made this brush with a sponge tip because the bristles around this brush are much better because there are more of them. but i feel safe knowing...read full review »