In addition to any other notice required to terminate any lease or rental contract, any tenant vacating any such tenement shall notify the landlord or his agent, at least seventy-two (72) hours before such removal as to the date upon which he proposes to vacate. Upon vacating, such tenant shall secure and lock all doors and windows, and openings in cellars and cellarways, and shall leave the premises clean and free from debris and trash. Within twenty-four (24) hours thereafter, such tenant shall deliver all keys to the demised premises in his possession to the landlord or his agent, in person or by registered mail, and receive a receipt therefor. Neither the delivery of such keys nor the acceptance thereof by the landlord or his agent shall relieve the tenant of any liability for rent due or to become due or for any other obligation under the term of his lease or rental agreement. (1961 Supp., § 12.52)