Might be a bit late but have a look at using detailing clay...
Meguires does a kit that contains a clay block and one of its magic sprays to use as a lubricant. Costs (from memory) about 30 bucks. Removes contaminants and will leave the paint very smooth.
Our car detailing bloke uses clay, but he uses the suds from the wash to lubricate before he rinses.



I usually put the hose on it for a good while before attempting to remove it.
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it is a better quality paint used on more expensive vehicles and a more correct application. if the poop was left on for even a couple of days and car was parked in sun anywhere, it is bad news for your paint. auto glym is fantastic, professional grade and is what we used at work. wash your car and apply that regularly after a wash. be aware that if a cutting compound is ever used, it takes a thin layer of paint away each time. polish and wax adds a film. what ever you do, do not use a scotch bright pad or the likes (you know the hard side of your dishwasher sponge type thing) as that scratches and scuffs paint. haha the amount of times cars would come in as people had used those to get stuck into stains, tree sap, bird poop etc! i am over the top with my paintwork. been slack lately. but i normally like to apply auto glym high res polish every second month after a wash. and every time i do the quick wash using the wash bay things i always use the spray wax afterwards just so i know there is some sort of barrier protecting my cars paintwork. i am a fully qualified spray painter though so always carry water and soft rags in the car (or baby wipes) just to wipe bird poo especially off as soon as it happens. nasty stuff that comes out of birds! :O 
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