@nomli, Dr Brown bottles have those pipe cleaner-like things to clean the little things inside the bottles for colic prevention. I use those to clean the inside of the straws and soak them in hot soapy water. I typically only put water in those cups though and if I put milk or juice in them, I try to wash them out as soon as the cup is empty.

@airwren123, same! Sometimes I give her the ones that have the little plastic piece that closes the top and folds the straw down but she doesn’t seem to like those ones

@cheyannemg, I had that too! And the cups even came with a pipe cleaner thing! But right where the two halves joined it always got little specks of mold INSIDE where it joined. So no amount of scrubbing got rid of it. I rarely put milk in them, though, because it always leaked worse than water with milk.