it's probably not bird dropping but factory paint defect. The ones that are on the aluminum framing they might be able to get out if they are know what they are doing with polishing (if they don't, they could mess up the paint job seriously).
I actually have half a dozen of these are least, probably more. However, almost all of mine are located on the black trim pieces around the windows (the piller areas and the wider area in between the windshield and the start of the pano roof). I showed these to the guys are the Queens service center yesterday and he said those pieces are not painted by Tesla - those come directly painted by a third party supplier. These ones cannot be polished out. They would need to cut out the entire pano roof areas to replace that part. They said they would replace those under warranty but they said they dont recommend doing it because it involves cutting a lot of things and tearing the entire roof off essentially. I honestly don't really care to make a big deal about this and I'm not comfortable with them cutting things and dissembling the entire roof just to replace those black panels so I opted not to do anything about it. There are more important things in life than complaining about a few paint spots on my car, seriously. Just rotate my tires and give me some windshield wiper fluid and let me on my way