Birds make a mess of our carport - it’s like their own condo. I tear nests out every day. This is the heavy season. Go now, I’m tarping my canoe, trying to devise a cover for the entire rack and its occupants. I’m wondering if there’s not an effective deterrent to settlement. Maybe used cat litter. They just pooped on the fake owl I tried. No sure if birds act on scent but I’m going to give cat litter a shot. So far I’ve tried foam, wire, the plastic owl, smoke, water, noise and constant nest clearing. If baby chirps emerge, I admit defeat and leave the brood to occupy.