अज्ञानोच्छिष्टकरस्य क्षालनं ज्ञानवारिणा ।विशुद्धस्यात्मलिङ्गस्य हस्तप्रक्षालनं स्मरेत् ॥ २२ ॥
In plain words
The hand is smeared with the leftovers of ignorance; wash it clean with the water of knowledge. Hold that in mind as the hand-rinsing offered to the ātma-liṅga, which was always spotless.
Close to the Sanskrit
The washing, with the water of knowledge, of the hand soiled by the leavings of ignorance — that one should call to mind as the hand-rinsing of the wholly pure ātma-liṅga.