Bad water spots
You don't have to be next door to industry to get acid rain, and it you got greasey residue after a rain that left water spots, that's almost surely what it is.
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1st : rubbing compound if swirl mark remover fails.
2nd : swirl mark remover
3rd : ultra fine polish
if that fails
use
1st : vinegar
2nd : water it down dry it and swirl mark remover
3rd : ultra fine polish

lmk if anything works




