In the first phrase, the words "to make me clean" are understood because of the second phrase. AT: "If you are willing to make me clean, then you can make me clean" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
In biblical times, a person who had any of certain skin diseases was considered unclean until his skin had healed enough that he was no longer contagious. AT: "you can heal me" (See: [[rc://en/ta/man/translate/figs-metaphor]])