What should I do about my roommates?

You could try talking to them, not in a hateful way, just "what's up?" Try to find out what the problem is in not doing their share of 'clean up'. Ask them if they thought it would be best if you move out? Let it be their decision, (they think). If you get hostility from them, then you know what you need to do. If they're friendly, don't want you to move but continue to leave messes(after finding out it bothers you), you know what you need to do.