Yep same here. My house looks like a dump. I'm actually taking a week off work to try & do something about it. That gives me 3 days when the kids are at kindy from about 8.30 - 4 ish to:
Clean & declutter entire house
Check FB & BB
Eat, nap, watch a movie
Visit a potential school for DS
Doctors appt for DD
Go to gym

So you can guess which item on the list is most likely not gonna happen I have set myself two tasks though - the study and my clothes. The rest can wait.

I try to keep on top of it Flylady style but it only takes one or two days of sick kids/ sleepless nights/ just being lazy & you're back to square one. I have more important things to do than spend all my life cleaning.

We do the massive cleanup when visitors are coming thing too. It's the only time the house looks half decent - just don't open bedroom or cupboard doors!