I have a living room, kitchen, bedroom, kids rom, bathroom and back room. I can have one or two of these rooms clean at one time, but why not all? I'll tell you why. Because while I am in the kids room cleaning, they are in the living room trashing! And the minute I clean the kitchen, it's time to eat again, and therefore mess it back up.
On an up note, today I asked them to clean up real quick before we went to the bank, and they did! Yesterday it took a half an hour to clean up just the doll stuff...but today they cleaned. So yes, there is hope.