So, when you were a mom the first time.
Did someone need to tell you that the valves on sippy cups need to be removed when the cup is washed?
Was this obvious to you because you tend to be a germ-a-phobe and just knew that stuff grew up in that spout and the only way to get it clean was to remove the valve.
Did you end up figuring this out after several freshly filled 'clean' cups ended up with 'floaty gunk' mysteriously appearing.
Did someone point this out to you after your toddler shook a freshly filled 'clean' cup and saw 'flaoting gunk' in the cup?