Our school sends the bottles home on Fridays for parents to wash. Since they only have water in them, I think that's fine. They don't need cleaning more often (imo).
2 of the other mums with a child starting reception this week are HORRIFIED. They also restrained themselves from saying that I'm a slattern, for thinking once a week is fine. They think bottles should be washed daily.
Just wondered, what do other schools do, parents think?