Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Because of Krsna’s having sucked the breast of the Raksasi Putana, when Krsna killed her she was immediately freed of all material contamination. Her sinful reactions automatically vanished, and therefore when her gigantic body was being burnt, the smoke emanating from her body was fragrant like aguru incense.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Such are the effects of Krsna consciousness. If one somehow or other becomes Krsna conscious by applying his senses in the service of the Lord, one is immediately freed from material contamination. Srnvatam sva-kathah krsnah punya-sravana-kirtanah (Bhag. 1.2.17). Hearing about the activities of Krsna is the beginning of purified life. Punya-sravana-kirtanah: simply by hearing and chanting, one becomes purified. Therefore, in discharging devotional service, sravana-kirtana (hearing and chanting) is most important. Then, with purified senses, one begins to render service to the Lord (hrsikena hrsikesa-sevanam). Bhaktir ucyate: this is called bhakti. When Putana was somehow or other, directly or indirectly, induced to render some service to the Lord by feeding Him with her breast, she was immediately purified, so much so that when her nasty material body was burnt to ashes, it gave off the fragrance of aguru, the most agreeably scented herb.