Living alone helps to teach notions of responsibility for things, if they hadn’t already been learned at Mother’s knee. If I don’t do it, then it won’t get done.
And I will admit that there are things that don’t get done quickly, or at all, at home. I’m not a “neat freak” (far from it!) so my floors are not well vacuumed or swept, the mail sits unopened for quite a while (or forever, if I knew that it wasn’t important), and I’ll leave dirty dishes in the sink if I don’t feel like washing up this evening. And yes, the microwave is not always pristine.
But if the floors are ever going to be vacuumed or swept, the mail put away or shredded, the dishes washed and the microwave cleaned up (and the refrigerator cleaned, the shopping done, the laundry washed and put away, the yard picked up and then mowed, etc. and etc.), then I’m the one who will be doing it.
And at work, knowing that standards have to work for all of us, I modify my behavior to fit in with the group norms – and clean up the microwave from every speck of my spill, and at the time. It’s annoying AF when people don’t get that and act accordingly.