Any of you use dr. Brown bottles? Will my son does because the hospital gave them to me. I know they are not cheap at the store. Had these bottles like 2 months and there not fun to clean try using the little cleaning tool that's in the box and let them soak in hot soapy water for a while but I have had no luck getting them clean. Im starting to dislike the bottles. The picture show a part the bottles has and it's has pink stuff that will not come out.