purge
From LSJ
Θεὸς συνεργὸς πάντα ποιεῖ ῥᾳδίως → Rem facile quamvis peragit adiutor deus → Wirkt Gott als unser Partner, macht er alles leicht
P. and V. καθαίρειν, ἐκκαθαίρειν, V. ἁγνίζειν, νίζειν, Ar. and P. διακαθαίρειν. See also wipe away.
in medical sense: P. καθαίρειν.