Related Clues:

• Flue buildup
• Santa soiler
• Grate stuff
• State-of-the-art
• Smog contributor
• Pipe sullier
• Combustion residue
• Up-to-the-minute
• Santa's soil
• Flue collection
• Smoky grime
• Smokestack emission
• Chimney sweep's concern
• Least hackneyed
• Combustion by-product