Gunky buildup (4)

I believe the answer is:

crud

'gunky buildup' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for crud that I've seen before include "Disgusting waste matter" , "worthless stuff" , "Unpleasant substance" , "Disgustingly foul substance" , "That's disgusting" .)

I've seen this clue in the Newsday, the Universal, the Newsday.com and the USA Today.

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