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Birds naturally crap over water. That's why you'll never see a beat up pickup with bird crap on it. The reflection off a shiny car is always their preferred target, and I'm guessing coupes get more as the glass isn't as vertical as other vehicles.
So too much crap in your garage and too much crap on your car. Sounds like a really crappy situation going on there. At least you didn't leave the sunroof open. Good news is that the crap on your car will make you take care of the crap in your garage so you can give your beauty a proper home.