We've heard that acid from the bird droppings is the reason for the doo-doo perforations, but a study by UK car care experts Autoglym reveals that the excrement is only part of the problem. The real culprit is the sun, which expands and warms the paint on your vehicle. When the sun hits that bird poop, the poo hardens at the same time the paint expands. When the sun sets and the vehicle cools, the paint then contracts and forms itself around the hardened crap.
If a bird does his or her business on your vehicle, the best thing to do is remove it, and fast. A moist cloth will do the trick in most instances, or if you're not into close encounters of the rectal kind, you could also hit the car wash. We would go into more detail, but we're thinking that's enough excrement talk for one day.
Autoglym's has outlined some tips for minimising the risk of damage from bird droppings: