Apply a thin coating of oil over the goo on the window with a paper towel. Let the oil sit on the window overnight
Wipe the window with a washcloth to remove the goo.
Spray the window with a lubricating spray if the goo remains. Let the spray sit on the surface for two or three hours. Wipe the glass with a washcloth to remove the residue.
Apply a citrus-based adhesive remover to the goo. Read the label directions carefully to apply it to the window without damaging the glass.
Clean the windows with a solution of 2 quarts water, 2 quarts rubbing alcohol and 2 to 3 drops of liquid dish washing soap. Pour the solution into a spray bottle then apply it to the window. Wipe the windows down with paper towels to remove any lingering residue.