At least once a year, convince yourself that you don't have to be a Crappy Housewife forever. Buckle down and commit to some kind of crazy system or scheme. (My annual scheme is Hour-a-Day April.) Really, truly believe that you can change. Work your tail off as long as the motivation lasts.
And then, if it doesn't last forever (which it never does), at least your house is in better shape than it was before. Having a clean house once a year is better than never, right?