Mentioned I cleanse it using sterile, saline fluid (7)

I believe the answer is:

eyewash

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'it using sterile saline fluid' is the definition.
The definition suggests a singular noun which matches the answer.

'mentioned i cleanse' is the wordplay.
'mentioned' indicates a 'sounds like' (homophone) clue.
'cleanse' becomes 'wash' (washing is a kind of cleansing).
'i' sounds like 'eye'.
'eye'+'wash'='EYEWASH'

Can you help me to learn more?

(Other definitions for eyewash that I've seen before include "this is soothing sight" , "Insincere talk or optical lotion" , "Pupils may benefit from this" , "Balderdash" , "Rhubarb" .)

I've seen this clue in The Irish Times.

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