Related Clues:

• Caked deposit
• 'Oh, darn!'
• Like Uncle Buck, in 'Uncle Buck'
• "Oh, shoot!"
• Disgusting buildup
• Disgusting stuff
• Largely unrefined filth
• It's nasty, brutish, short
• "Dang it!"
• Muck (slang)
• Grunge or gunk
• Guck
• Unpleasant substance
• Disgusting deposit
• Disgustingly foul substance