Angrijha

Bhagirath was sent to the ashrama of rishi Vashistha for his education. One day Bhagiratha came home disturbed. His friends had told him he had no father. The prince wanted to know from his mothers who his father was. The queens told him about Sagara, his sons and told him he was the son of King Dilipa, born from the grace of Shiva.
Hearing this, the young prince wanted to go to the forests and pray. The queens tried to stop him, but he would not listen.
In the forests, he first prayed to Indra for years. Indra appeared before him and asked him to pray to Shiva, who would be help him.
Bhagirath prayed long and hard and Shiva appeared before him. Shiva asked him to pray to Vishnu and also told him that he would be successful in getting Ganga to earth.
Bhagirath prayed to Vishnu. Finally Vishnu appeared before him. Vishnu asked Bhagirath to take Ganga with him and took him to where Brahma was. Brahma seeing Vishnu coming, washed his holy feet with the water he had stored. As Ganga had been used to wash the feet of Vishnu, she became known as Angrijha. (The closest Sanskrit meaning for the word is probably - That which is used in the lower limbs. As the water had been used on Vishnu's feet, thus the name came by).
Vishnu and Brahma then asked Ganga to go with Bhagiratha down to earth. With the mere touch of Ganga, all sins would be destroyed.

Ganga was sad. She said all will wash their sins became pure, but I would have to bear their sins. How will I become pure? Vishnu said, whenever a Vaishnava would have a dip in the waters, you will get pure. I reside in the Vaishnavas and thereby, a Vaishanav's touch would be my touch, and you will become pure.
(This gives an idea of the great sense of the Vaishnava Cult, that was prevalent then, when Kriitivasa was writing this.)

Giving a Conch Shell to Bhagirath, Vishnu said you go blowing the shell. Ganga will follow you.