Ashtangasamgraha 31.20

31.20

dhārayet pūraṇaṃ karṇe karṇamūlaṃ vimardayan |

rujaḥ syānmārdavaṃ yāvanmātrāśatamavedane ||

tato 'sya secane nasye tarpaṇe ca hitaṃ haviḥ ||

should maintain the filling in the ear while massaging the root of the ear,
until there is softening of pain, or for a hundred counts in the absence of pain.
Then, for his sprinkling, nasal therapy (nasya), and nourishing eye-drop (tarpaṇa), clarified butter is beneficial.