Any chance you can post up a pic so when can have a better idea what you have to deal with?
I'd try buller scotts suggestion but make sure it's warm water as it will help soften.
If you have no luck with that i'd get a spray bottle and either mix in some carwash or some APC cleaner with some warm/hot water and mist it over the poo so it's stays on and doesn't rub off. Then grab either a soft detailing brush and after leaving it soak for a minute or so very "LIGHTLY" brush over it in one direction to minimise the chance of scratching the paint work.
If you use APC it may remove the wax on your car so if you succeed with you probably want to clay bar the whole roof and re apply wax after.
This is just how i would probably attack it,i know if it happened to me and it had effected or stained the paint at all i have a Ro polisher to hopefully correct the issue afterwards.
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