Related Clues:
- Ingrained dirt
- Dirt, grease
- Although it's dirty, Gee, how white it is!
- Cleaning challenge
- Old machinery coating
- Dirt, say, swirling round edge
- Slimy, oily or dirty substance
- Unpleasantly messy substance (informal)
- Sticky residue
- Golf crime drops Charlie in dirt
- Icky coating
- Mop target
- Oil filter accumulation
- Scrubber's target
- Greasy residue