I never make my kids clean their rooms
In our household, my kids (3 girls, ages 12, 10, and 9) are never required to clean their rooms. They only do so if they choose to. None of them ever clean their rooms. The rooms aren't so much dirty as they are cluttered. You cannot see the floor in any of their rooms. But that is ok because it is their choice. They have no requirement to ever clean their rooms; that is a firm promise I have made to them. There only rule is that their mess can never encroach outside of their rooms. They honor that rule. But I don't think they will ever choose to clean their rooms. But that's ok. Their choice.