Yes, sterilized every time. May be you can consider buying an additional funnel (喇叭). It's worth spedning the money if you think of continue pumping after going to work (if you hv to go to work).
I haven't ar...as it states the mammy's milk can store at room temp (around 22C) for 6-8 hours, so I haven't washed for the second time, 11:00 the first time, and 15:00 for the second one