Dr Brown bottles. They have like, little filters on them that help prevent gassiness, the holes on those are so narrow the pipe cleaners can be hard to pull back out.
Also, the milk can get a bit coagulated if you don't wash them immediately, which is often hard to get done. Sometimes the water pressure just won't get it off, gotta use a scrubber on a stick.
What kind of bottles? Can't you just blast em a bit full of dish soap, run hot water into it until the suds stop, rinse and repeat as needed?
Dr Brown bottles. They have like, little filters on them that help prevent gassiness, the holes on those are so narrow the pipe cleaners can be hard to pull back out.
Also, the milk can get a bit coagulated if you don't wash them immediately, which is often hard to get done. Sometimes the water pressure just won't get it off, gotta use a scrubber on a stick.
Don't drink milk. Simple as
My infant needs to drink milk
Edit:
To be clear, these:
In all fairness I didn't know there was a baby in play. Then yeah, do what ya gotta do.