Related Clues:

• Balsam, e.g.
• Amber source
• Varnish source
• Greasy stuff
• Thick, messy substance
• Amber material
• Grime
• Shellac ingredient
• Engine buildup
• Amber, for one
• Icky residue
• Tree exudation
• Engine fouler
• Frankincense or myrrh
• Amber or epoxy