Possible Clues:

• Melted Popsicle, e.g
• Garden? Try one of the other two when disheartened
• Melted ice cream, e.g.
• Molten tar, e.g.
• Sticky stuff is to leave a ring
• Oozing crud
• Liquid tar, e.g.
• Oozing gunk
• Sentimentality that's not entirely pleasing
• Hair gel, e.g.