Skandapurana 5.264.15

5.264.15

bhṛṃgarājena puṇyena paurṇamāsyāṃ prapūjayet..
pratipaddivase sarvaiḥ pūjanīyo janārdanaḥ..
gomūtraṃ gomayaṃ kṣīraṃ dadhi sarpiḥ kuśodakam..15..

On the full-moon day one should worship him with meritorious bhṛṅgarāja. / On the first day of the lunar fortnight, Janārdana is to be worshipped by all; / cow urine, cow dung, milk, curd, clarified butter, and water touched with kuśa grass—