Related Clues:

• Icky residue
• Sludgy substance
• Engine fouler
• It's icky and sticky
• Word from the crib
• Yucky muck
• Moo __ gai pan
• Crude oil, e.g.
• Sludgy stuff
• Tar, e.g.
• Mucky stuff
• 'Ick!' evoker
• Exudation, maybe
• Icky or sticky stuff
• Oozy gunk