Bird Optical Gel
Bird Barrier Optical Gel™ may be used to deter feral pigeons, gulls, and many other unwanted birds from roosting on buildings and other structures. Bird Barrier Optical Gel is supplied in ready-to-use plastic-dish containers. These should be affixed to surfaces with commercially available silicone adhesive or other suitable and removable adhesive.
A multi-sensory bird deterrent:
Birds see dishes of fire and avoid immediately
They dislike the citronella smell (sweet to us)
They avoid sticky material (in the unlikely event they touch it)