XXX: You are not washing at all?
WOW: Well, before using my, of course, just not needed for a long time
YYY: We’ve noticed that girls almost always wash their laundry.
yyy: and we only when several mandatory conditions are fulfilled: 1) the glass is really needed for use right now. I want to drink; 2) the glass is really unrealistically dirty and some civilization is born in it, else "da pophug, normal" 3) there is no cleaner glass nearby.