It's spring. Our classics can go outside again.
Where the birds are looking forward to spring again. And birds poop on average 1 x per 15 minutes. But nature destroys more than you love. Especially when it is nice and warm, the acids that are in bird droppings 'eat up' on car paint.
It is essential that such places are immediately cleaned with a lot of lukewarm water.
If the bird poop has already hardened, place a soaked, soft sponge on it for a while. Then remove the stain. Do not rub, because then any hard pieces will scratch your paint.