A mixture of “there are some things which have to be done in certain days” (if I have a job, laundry has to be on the weekends due to time constraints) and “do as you go”.
If I have a snack outside the kitchen, the resulting containers / dirty spoon / trash get put in their proper places and/or washed the next time I’ve got to go in that direction and my hands aren’t full. Drives my mother crazy that if I’m in her living room and she calls me from her bedroom (on the other end of a U-shaped flat, with the kitchen at the curve), I’ll grab whatever candy wrappers she’s left near her armchair and stop by the kitchen to bin them; drives me crazy to walk into her living room or her office and see a pile of candy wrappers…
Cleaning the bathroom, what’s that? Unless there’s been a broken bottle of shampoo or some such, the shower and basin get left clean any time I use them; the tile floor gets washed when the kitchen’s does (or, in my mother’s all-tiled house, whenever the floor does); the bowl gets some occasional love from the duck-shaped bottle.
There’s still corners which need to get Big Cleaning treatments - but those tend to consist of “oh noes, a dust bunny! where did that dust bunny come from? AHA!” and moving up a bunch of cables which normally don’t get moved when I wipe the floor.
Mind you: I live by myself in a place most Americans would find tiny, the furnishings have generally been chosen with “easy cleaning” in mind, the rugs are bamboo (I can roll them up and shower them, as I did after the bricklayer left drops of concrete all over them) and the floors are parquet or tile.