A bottle nipple brush, as well as a straw brush; both very hard to clean spots without a proper tool to clean them with. (checkpregnancy.com)
My favorites have been the sterilizer, which is simple to use and the perfect size, and the bottle brush, which has great bristles and a convenient nipple brush. (chiccousa.com)
Sore nipples brushing against your nursing bras or nursing tank tops all day and all night won't be comfortable. (lovingmomentsbras.com)