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.com, the Newsday, the Universal and the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.