CRACKING?
If there is cracking in the paint surface, which can happen if the poop has been left on for too long and penetrated deeply into the paint, there is nothing any product or service can do to fix this, other than going to see your local panel shop and look at respraying the area. This could have been avoided if you removed the poop earlier.
So always keep a bottle of Clean Detail with a microfibre cloth in your car at all times!