Although bird droppings and smashed highway bugs might not seam like a big deal, it can do a serious damage to the paint of the car costing hundreds of dollars in repairs. Because bugs and bird poop has a lot of acid in it, the longer it sits on the surface of the vehicle the deeper it eats through the finish.
Some birds and bugs (like gypsy moth, june bug, bees, aphids and etc.) are more damaging than others. Bird named “ka ka” is not only highly acidic, but also uses gravel to digest its food. As a result, there are tons of grit in its excrement that can easily scratch the paint when you try to wipe it off.