The summer before last I was renting a house in addition to my apartment. (I had planned to move from the apartment to the house, but decided I liked the apartment better, so for a year I was paying 2 rents.)
Anyway, during the months I stayed at the house, I fell in love with bird watching. The house had a large back yard with lots of trees. I put lots of bird feeders and bird baths outside.
The only problem with that setup was the grackles that loved to dive-bomb my silver Camry. I would often clean off the droppings but not always. Anyway, there are about 20 spots on the Camry's roof and trunk that refuse to go away. They're the result of the bird droppings. Grackles are big birds. For some reason, the front hood was spared.
So how do I get my paint job back to normal? Waxes? Polishes? Professional care? It doesn't look that bad and sometimes it's not at all visible, but if the light catches the paint just right, the aftermath of the droppings can be seen.