Apparently, cleaning of any type. Just look around my house. I wish I could tell folks I'm doing the deep litter method in my living room .
Years ago, I thought my house was messy because I had littles and worked full time. Well, the littles are taller than I am and I'm now home full time. My house isn't as messy as it was then, but that's only because the former littles now have chores to do and they clean.
But the most disliked chore in the household is dishes, hands down. And yes, we have a dishwasher. It's still the week the boys hate in the rotation, and the one I have to nag to most about.