If you take clothes to a dry cleaner, you probably have a lot of extra metal hangers around. If they are building up, ask your dry cleaner if they'll accept the hangers back. Many dry cleaners do. If yours doesn't, find one that does and go to them instead. Reusing your metal hangers helps your dry cleaner reduce costs, it helps you clear out some clutter, and it helps the environment since fewer hangers need to be produced.