Source : Webster's Revised Unabridged Dictionary (1913)

Cleanser \Cleans"er\, n. [AS. cl[=ae]nsere.]
   One who, or that which, cleanses; a detergent. --Arbuthnot.

Source : WordNet®

cleanser
     n : a preparation used in cleaning something [syn: {cleansing
         agent}, {cleaner}]