Related Clues:
- Ugly buildup
- Spray 'n Wash target
- Discoloration
- Dry-cleaner's target
- Pine-Sol target
- Carpet mark
- Gross accumulation?
- Ingrained dirt
- Dirt, grease
- Black mark for saint
- Blotch on satin
- Although it's dirty, Gee, how white it is!
- Seems you're not goin', mark you
- One might get a black mark for the saint from this
- How Saint Mark comes to his own in Scotland