I don't know what it is about our couch but at least once a month I have to pull it out for cleaning. It is amazing how much stuff gets found at that time. I grab a broom and sweep everything to one big pile. The kids are told to pick their stuff up or it will go in the trash. They have learned that I mean what I say but they are so slow about the picking up. It is as though they are in a competition to see if they can pick up the least.
I occasionally sit on the couch to watch TV, otherwise I would wonder why we needed one. What are your hot spots for messes? This is just one of ours.