Amazing GOOP is a line of adhesives with the tagline "Glues Whatever, Bonds Forever." It's used in automotive and marine applications. GOOP is used to repair furniture. GOOP for lawn and garden can repair garden hoses and affix hose holders to brick walls. Removing this stuff can be something of a chore. GOOP cures in 24 to 72 hours. If you can, remove it before it cures using a little bit of acetone.
Find a solvent. According to GOOP's technical data sheet, there are a few solvents capable of dissolving GOOP. The most common is gasoline. (The rest are cyclohexane, perchloroethylene, 1,1,1-Trichloroethane, methylene chloride, chlorothane NU, Chevron solvent 1100, propyl acetate, and toluene) If using gasoline isn't your cup of tea, Goof Off or Goo Off may work.
Test a small area of the bond by wiping solvent on GOOP. Wait five minutes, and try to remove GOOP with a scraper. Choose an inconspicuous area. The solvent may dissolve coatings and paints.
Apply solvent over the entire area using brush, cotton balls or cloth. If there are any gaps between the GOOP and bonded surface, make sure to apply solvent there.
Scrape any loose GOOP off. Apply additional solvent as needed, paying special attention to areas where there seems to be gaps developing between the adhesive and the surface.