Related Clues:
- Smokestack buildup
- Diesel by-product
- Coat inside a chimney
- Pollution component
- Santa suit stainer
- Sweep's removal
- Carbonaceous grime
- Challenge for Santa's dry-cleaner
- Santa's suit stainer
- Dirty stuff in a chimney
- Residue in a chimney
- Chimney dirt and grime
- Dirt and grime inside a chimney
- Black dust of a sort
- Chimney liner