Incredibly trivial I know but DH thinks IABU.
I wash DD's (3) cup after every use. She has several of the Disney store type ones with the straw. She's quite thirsty most of the time so she has quite a lot of drinks every day. DH has been just refilling it all day and washing it night.
He thinks I'm being slightly obsessive compulsive and as I have manic depression he worries that this as well as my very frequent handwashing mean I'm heading down that path.
Help settle this disagreement please :)