Can you feel them or are they essentially even with the paint surface of the car?
I had some similar marks on my white car this weekend and I took a cloth and some Prepsol and wiped it down. The marks came right off. Of course, so did the wax, so you'll have to re-wax those areas if you do this.
I would try a solvent before I resorted to clay or abrasives. Possibly some Klasse AIO would work too.