Related Clues:
- Scummy deposit
- Icky accumulation
- Dirt, unpleasant, at bottom of scuttle
- Icky incrustation
- Filthy gunk
- Scrubbed-off stuff
- Kind of dirty music?
- Thick dirt
- Nonsense, and vulgar, mostly
- Soot, in quantity
- Gunky, mucky, semi-solid stuff
- Filth, say, rising across border
- Foul substance (informal)
- Yucky buildup
- Surface dirt