I have about 100 solar panels on my roof. Neighboring pigeons found the area under the slab a great place to nest. As a result - poop on the panels and on the roof. I've tried many different tactics, like non-drying silicone glue and jamming speakers, but I couldn't keep the birds away. I've tried blocking the holes with bricks and styrofoam but they cause heat to build up under the panels. It works fine without heating.