1. Best for cleaning the heart

    For one who wants liberation from the fruitive reactions of material activities, the chanting of the Hare Krsna mantra, or glorification of the name, fame and pastimes of the Lord, is recommended as the most perfect process of atonement because such chanting eradicates the dirt from one's heart completely.

    (From Srila Prabhupada's translation of SB 6.2.12)