פירוש על ירמיהו 2:22

with natron A type of earth with which garments are cleansed and rubbed.

soap Heb. בֹּרִית, cleanliness. Comp. “And pure (וּבַר) of heart” (Ps. 24:4). Some explain בֹּרִית as savon in French, soap.

your iniquity is stained Jon. renders: Like the mark of a stain that is unclean, so have your sins increased before Me.