My son asked why I always put his water bottle in the dishwasher but hand-wash the lid

My son asked why I always put his water bottle in the dishwasher but hand-wash the lid.

I told him the bottle goes through a rigorous sanitization cycle with jets of scalding water and industrial-strength detergent.

The lid gets a gentle rinse under tepid water while I try to remember which of the seventeen lids in the drawer actually belongs to it.

Punchline

It's called a tiered cleaning system—one for hygiene, one for hope.