The problem with bird droppings is that they are often acidic and they can etch in to the clear coat within minutes. As soon as possible you should wash the area and remove all the physical debris left behind.
To remove the etchings we have two suggestions. The Chemical Guys Water Spot Remover can be used to remove light etchings that are hard to see or feel. The more traditional option is to polish that area, starting from a less aggressive polish moving up to a stronger one as needed. We would suggest starting with medium pressure and a polish like the Meguiar's M205 and move up to the M105 if need be. If that doesn't work you may need the extra power of a buffer to help work those polishes in. With the help of a buffer you can remove the vast majority of surface imperfections from bird droppings.