Do not be tempted to scrub at baked on bird poop !.
Bird poop can contain small partials of grit.
Birds like to peck and eat small partials of grit, it helps with their digestive system ?.
If you have a large patch of baked on poop, take a couple of square’s of kitchen roll and dampen it with warm water.
Apply some car shampoo to the damp area of the towel.
Place the damp towel over the poop and leave it for about 20 mins.
The warm water and shampoo with soften the baked in poop, then carefully use the towel to remove the softened poop.
Do not scrub at it or it will scratch the paint finish !.
The poop can be acidic and leave a stain on the panel, even though the poop has been removed.
A compound maybe required to remove the etching.
This can be avoided by removing the poop as soon as possible,
The longer it is left on the panel, the more chance you have if it causing staining to the paint work.
As said above, a good resin / wax polish is required to seal the paint, if you use cutting compound.