I'm not quite sure what you mean but is it actual rubbish piles or just clutter? If it is clutter items from the build/buy menu you can just enter build mode and delete it. If it is actual piles of rubbish then you would have to either play as that family and then mark them as unplayed or take one of your own sims to visit and have them pick it all up.
I've actually never seen a house with rubbish in it form the Gallery, but then again I usually build my own. I wonder why builders do that? Weird!