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How to be responsible
Clean up after yourself without being asked.
When you make a mess, clean it up; don't just leave it there for someone else to find. You made the mess, so you should be the one to clean it.
Think about how another person would feel if they came into the mess or if someone had already cleaned it. For instance, if you create a huge mess while making a sandwich, take the time to put the ingredients away, wipe up spilled crumbs, and wash any dishes you made or put them in the dishwasher.