Related Clues:

• Dirt
• Muck
• Detergent target
• Laundry challenge
• Sooty dirt
• Laundry problem
• Filth
• Stubborn dirt
• Cleaners' concern
• Filthy stuff
• Scrub brush target
• Engine buildup
• Sandblaster's target
• Gunky buildup
• Dizzee Rascal's genre