You could do what the woman a few weeks ago on the Today show did. She packed all the kids and Hubbies stuff up that they didn't pick up and sold it all on ebay. The woman who bought the whole lot for 400 dollars offered to give it all back but the mom said No it would never get her point across so they donated everything to charity. They asked her if she still has this problem and she says they all pick up now.
However, this may end a relationship. I like Nanci's idea. Hire someone to do it.