Source: KleshaharNamamruta Stotram which is from Bhoomi khanda of Padma Purana
King Yayaati has made the Divine nectar, which is Chanting the Divine Name of the Lord, available to all the people for making their life happy, peaceful and prosperous. King Yayaati wanted to make the whole kingdom as a heaven by making all people Chant the Divine Name of the Lord.
The Divine Name Keshava removes all the troubles and sufferings of all the people and blesses them with the best of boons. The Divine Name is all blissful and parmartha tatva. The Divine Name of God Vishnu is just like a Amrut, that removes all contaminations, and it is propagated by King Yayaati for the benefit of all people.
श्रीपद्मपुराणे भूमिखंडे क्लेशहरनामामृतस्तोत्रम्
श्रीकेशवं क्लेशहरं वरेण्यम् आनन्दरूपं परमार्थमेव ।
नामामृतं दोषहरं तु राज्ञा आनीतमत्रैव पिबन्तु लोकाः ॥