Ashtangasamgraha 28.10

28.10

uttarabastirapi snehonuvāsanavacchodhanaṃ nirūhavadapi kecidāhuḥ sa nirūhāduttaramuttareṇa vā mārgeṇa dīyata ityuttarabastiḥ ||

kāyaṃ ca virecayet |

suśītaiḥ śatadhautaghṛtānvitaiḥ śiro vaktraṃ siñcet pradihyācca ||

The uttarabasti also is an unctuous substance like the anuvāsana; some say it is also a purifier like the nirūha; it is called uttarabasti because it is given after (uttaram) the nirūha, or by the upper (uttara) route. / And one should purge the body; / one should sprinkle and coat the head and face with very cold substances mixed with hundred-times-washed ghee.