Pungent gas used in cleaning fluid (7)

I believe the answer is:

ammonia

(Other definitions for ammonia that I've seen before include "Colourless pungent gas" , "Gas released by smelling salts" , "Pungent cleaner" , "Pungent gas formed of nitrogen and hydrogen" , "Gas compounded of nitrogen and hydrogen, NH3" .)

I've seen this clue in the Sydney Morning Herald.

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