see wut great advise you get here.................
keep it waxed and it will still get dirty
i would be inclined to say thats somethin off the asphalt (
do you park under or near an elm tree , tree sap will eat at paint give it time.
my old D100 was white and no matter wut i did those pesky spots always showed up , so i figured it was in the paint to begin with , so i sold the truck.
best of luck