Paint on car has something like tree spit

[Don S]

I think I must have parked under a tree and got spit on by the tree. It is not sticky like I have had before , but very fine to the feel. I have tried water and soap, windex , various polishes , alcohol ,( not the drinking type ) . The paint is in really good condition , Ditzler enamel painted nearly 50 years ago , so I don’t want to be too aggressive . Any ideas ?

Thanks. Don S