My father died four months ago with debts. I renounced the inheritance. He was renting his home. Am I obliged to clear it out?

No. A renouncing heir is considered never to have been an heir (Article 805 of the Civil Code). The landlord may request that a judge authorize disposal of the furniture or refer the estate to the public authority for debt recovery (Articles 809-1 to 810-3 of the Civil Code).