The girls have so much stuff it's hard to control it. We have very generous friends who pass down all the toys their children have outgrown. We have very generous relatives who spoil the girls. This results in way too much stuff in our house.
Usually I require the girls participate whenever I clean out their stuff. I want them to understand that when some stuff comes in, some stuff needs to go out.
Three weeks ago, I decided I had spent enough time trying to get the girls to clean up their stuffed animals. I went into their room while they were in school and reassigned a dozen stuffed animals. By the time they got home, everything was done.
In the days that have gone by since then, the girls haven't even noticed that the stuffed animals are gone. We always say they have so much stuff that they wouldn't know if anything was missing. Now we know it's true.