Bird Barrier Optical Gel (24 pack)Optical Gel is a multi sensory bird repellent that deters birds using sight, smell and touch. Optical Gel is based on all natural, 100% safe ingredients. A proprietary blend of citronella, mint oil, agar, and beeswax create an unpleasant feeling for the birds, having a sticky texture and scent that keeps birds away. Use on ledges, signs, balconies, soffits, beams, skylights, signs, roofs, HVAC equipment, enclosed spaces, etc. Works on all bird