Related Clues:

• Laundry problem
• Grunge
• Icky stuff
• "Rats!"
• "Shoot!"
• Filth
• "Phooey!"
• Gunky stuff
• "Drat!"
• Stubborn dirt
• "Darn!"
• Cleaners' concern
• Filthy stuff
• Filthy incrustation
• Scrub brush target