νίψον ἀνομήματα, μὴ μόναν ὄψιν → wash the sins, not only the face | wash my transgressions, not only my face
quamdūdum: more correctly as two words, quam dūdum.
quamdūdum, depuis combien de temps ? Pl. Amph. 685 ; Ter. Eun. 697 ; Cic. Att. 14, 12, 3.