to produce clean; clear of filth, impurity, illness, or, overall, from whatever is polluting, noxious, or offensive.
To free of moral impurity or shame.
To remove; clean or purge away.
In calico-printing, to make (the undyed parts) white and clean by detatching the surplus of mordant from them by immersion in a bath of cow-dung and tepid to warm water, or perhaps in some artificial replacement; to dung.
In brewing, to get rid of the fungus from (the beer).