Related Clues:

• Unpleasant sticky material
• Sticky material
• Sticky goo
• Nasty buildup
• Residue in a bathtub drain
• Unpleasant buildup
• Garage goop
• Grease-trap stuff
• Some holding unknown sticky substance
• Slimy matter (informal)
• Degreaser’s target
• Greasy goo
• Engine accumulation
• Goopy buildup
• Slimy oil substance