Highly recommend Meg's Scratch X. Use a small amount on a foam applicator pad and hand rub it in several directions. It takes a while if the poop is etched in the clear coat. I had a Suzuki (metallic black) that was really bad on the hood. I spent at least 5-6 minutes working Scratch X and it removed the offending stain.
I've got a couple of pic's posted in the Meguiar's photo gallery if you want to look.