Crossword Genius

Ingredient in soapmaking (3)

Ross

I believe the answer is:

lye

(Other definitions for lye that I've seen before include "solution that comes out in the wash?" , "Alkali washing solution" , "Alkaline solution used for washing" , "Strong alkaline solution" , "Strongly alkaline wash" .)

I've seen this clue in The New York Times.
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