Related Clues:
- Cleaning lady's target
- Sticky goo
- Nasty buildup
- Residue in a bathtub drain
- Half of edge collecting another's dirt
- Mr. Clean's target
- Unpleasant buildup
- Dirty coating
- Muck is dreadful, coming to middle of field
- Engrained dirt
- Dirty gunk
- Dirt, for example, seen back round edge
- Dirt, dust, soot, etc
- Filthy buildup
- Ingrained dirt, dreadful by end of aisle