Fleece cleanser (5-3)

I believe the answer is:

sheep-dip

(Other definitions for sheep-dip that I've seen before include "'Pesticide mixture for ovines (5,3)'" , "Farm animal disinfectant" , "Pesticide bath for proverbially silly animals" , "Fleece cleaner" , "Fleece disinfectant" .)

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

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