I have a swan issue. A family of five beautiful swans (Flanders, Vesta and their cygnets Bobby, JR and Cliff) have taken to sleeping near the deck of our holiday house which we rent out. The deck is quite large and then you step off it onto some grass and then a few feet away is the lake where they spend most of their time. I have no problem with the swans being there, but they have now taken to coming onto the deck and pooing all over it. I don't mind the poo on the grass as we can clear it up every now and then and it's fine, but on the deck it's a pain and gets in the crevices and so on. Does anyone know if there is anything I can put on the deck that will not hurt them, but would persuade them to stay on the grass?