I just went through this. I was sooo pregnant and tired and had to clean every week. I would just pick a room a day and deep clean it until it's managable. I know the kids will have it messed up by the time you go full circle, but just decluttering....and I mean serious decluttering will make it so much easier to clean from then on out. Good luck. I remember how hard this was for me. I'd just sit on the couch and almost cry.