Should I wash the bottles after the family member baby sits ?

Sammi

I personally exclusively breast feed and when I leave him with a family member when I go out, not more than a few hours, they will give him a bottle with formula. I'm about to start pumping for them but that's beside the point. They never ever wash out the bottle or anything, they just leave it on the bottle full of milk. I don't use it and so I don't want to wash it or remember to really. Should I leave it there, just go wash them, or ask them to wash it out afterwards?

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