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Bird droppings are widely variable as far as what kind of damage they do and how quick they do it. It depends on the kind of bird, what its diet consists of, how long it stayed on the paint, the outside temp, etc.
I've definitely seen bird poop and water spots that have etched into the clear deep enough to require sanding. I've even seen it on brand new cars still on the lot.
It is very likely that you can polish it out by machine, since doing it by hand didn't do the trick. It's also less likely, but possible, that it might require light sanding.
My advice to anyone is get the bird poop off as soon as you see it. Don't wait til you do a normal wash, by then it might be too late. Keep a kit with a soft microfiber and some quality detail spray in your glove box or door. Spray the poop and let the quick detail spray soften it up before wiping it off with a towel. Even if you put some light swirls on the paint getting it off (and if you're careful, this shouldn't happen), that's preferable to a bigger, more noticeable etch from letting it sit until a wash.
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