Crossword Genius

Common secretion gets much use when scrubbing bottoms (4)

Ross

I believe the answer is:

snot

'common secretion' is the definition.

I don't understand how the remainder of the clue works.

(Other definitions for snot that I've seen before include "Dog" , "Mucus" , "Contemptible type" .)

I've seen this clue in The Guardian.
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