Simply ask them to. When you see someone headed to the kitchen with a dirty plate, call out "Hey, John/Sally - could you please wash that when you are done? Thank you!"
And before you go to the store, tell them you are going and ask if there is anything they need. When they tell you, mentally add that up and say "OK, that should be about $20. I'll wait while you get your wallet."
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In the midst of winter, I found there was, within me, an invincible summer." - Albert Camus