Maybe if you are driving through sandstorms....

My SSB has no such marks.

Do they look like they are through the clearcoat and into the paint, or are they just surface marks?

If it is just on the surface, any of the car cleaner, sealer, and wax systems should take care of it.

Some people are sold on Crystal Guard, or Zaino. I used Mother's, and I was really pleased with it. I know WMichaels likes it too. I think AZ has tried it as well.

Good luck cleaning it up!