Crossword Genius

Optical cleanser (7)

Ross

I believe the answer is:

eyewash

(Other definitions for eyewash that I've seen before include "Visual cleansing agent - nonsense" , "Optic solution to relieve irritation - rubbish!" , "Insincere talk or optical lotion" , "Balderdash" , "this is soothing sight" .)

I've seen this clue in The Guardian.
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