Baby bottles need to be cleaned with warm water and soap, and dried completely. Some baby bottles are dishwasher-safe, but make sure to double-check the packaging.
Sterilization is the best way to clean a bottle, but it only needs to be done occasionally. Sterilizing equipment is useful for busy moms, and some bottles are self-sterilizing.
Another way to sterilize is to soak the bottle in boiling water for several minutes.