hi all, i left my car last week and its fine. Today i went back to it as it looked like hundreds of 1-2mm round rust spots all over it. I actually nearly cried

now i.ve tried polishing out scrubbed it like a bitch for hours and its get the most of but if u look closely they are still there. Has anyone come across this before? At first i thought it was fallen pollen from a tree but i guess that would wash out, its a yellowy brown colour just like rust. Someone please help cheers luke