@arlene2712, I bought a bottle steamer. It was about $40 but I use it every day since it's so easy and quick. I wash bottles with soap and water then load up the steamer.

Online microwave ones are around 15 and than there's one that steam with out the microwave and those are around 40 I think and than there also ones that u can put in the dishwasher if u have one for around 8

@cupcakecodi, I seen that ! But online haven't seen in store , do you happen to know if there expensive ?

@1130nnne, awesome ! I'll check it out tomorrow (:

@mamalamadingdong, I told hubby same thing , we've only had these bottles for like a month and some for 2 and I'm already tired of them lol I really like the avent ones and my son seems to like them too

Boiling works best but they also have steam cleaning machines that you can purchase that helps sanitize them as well

in target they have a bottle soap, and it works great I'm sorry I forgot what its called and its around 7dollers

I haven't used formula so I can't make a 100% guarantee, but try spraying some white vinegar and maybe letting it soak in it for awhile. I wash everything with vinegar before using soap or anything. (The smell does go away, lol.) Maybe it's time for new bottles if it has that deeply penetrated the plastic, though?

boiling them probably isnt the quickest way but def the best way to get them super clean