54-1 Bird Proof Non-Toxic Gel Repellent Deterrent Scarecrow. Bird Proof Is A Long Lasting, Non-Toxic, Tacky Bird Repellent For Use On Ledges, Sills, Beams, Rafters And Hundreds Of Other Indoor And Outdoor Locations Where Nuisance Birds Land Or Roost. Bird Proof Repellent Can Effectively Discourage Pigeons, Starlings, House Sparrows And Certain Other Nuisance Birds From Roosting On Or Returning To A Treated Area For Up To One Year.