Related Clues:
- Half of edge collecting another's dirt
- Accumulated muck
- Mr. Clean's target
- Mostly offensively coarse nonsense
- Caked-on dirt
- Dirty coating
- Muck is dreadful, coming to middle of field
- Gross muck
- Engrained dirt
- Dirty gunk
- Dirt, for example, seen back round edge
- Dirt, dust, soot, etc
- 'Oh, fudge'
- Caked filth
- Caked-on buildup