Yuck... lol...
For a couple poop stains, I use Meguiar's Quik Detailer. For anything more, I'd wash the whole car.
Best long-term thing to do is to keep the paint safe with a good coat or three of wax. Well, that, and possibly a car cover, although a turd-encrusted cover won't be fun to deal with in a year.
I've seen some truly awful bird poop incidents, too. One car, parked on a downtown Lincoln, NE, street, had so much poop that the surface area was nearly half paint and half birdshit. UGH.
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