The Compendium of Caraka 6.26.224

6.26.224

tailaṃ siddhaṃ bastamūtre karṇaśūlanivāraṇam/
varāṭakān samāhṛtya dahenmṛdbhājane nave//

oil prepared in goat's urine removes earache. / Having gathered cowrie shells, one should burn them in a new earthen vessel;