Learn to notice things that need cleaning.
Know a good way to get rid of everything you possess when you no longer need it (bookcrossing, electronic waste recycling or just a trash bag). Learn to notice when you have things cluttering up the place that you no longer need.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.