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try clay on that, i bet it removes it. then a light polish might be needed.
Don't think clay will be the magic.
Try a dual action random orbital device and buff away like crazy
The easiest solution is to take to a detailer and spend a few hundred
correct, that will work fine. post some pics after the clay and we can make any further recommendations needed.
be sure to tape off the plastic grey trim before using polish or compound, otherwise it will turn it white and be a big pain to get off
Besides getting a professional, here is the process I recommend
1) Use 50/50 mix of IPA + water to wipe down the area with a microfiber to see if you can remove as much paint transfer/dirt as possible
2) Use clay + clay lubricant to clay as much residue as possible, with clay speed is more important than downwards pressure
if still noticeable:
3) Use a clean microfiber and a product like Meguiar's ultimate compound to hand buff those areas remembering to tape off gray plastic trim
4) If gone, follow up process with a finer polish like Meg's ultimate polish and hand buff with a microfiber
5) highly recommend following up with a wax or sealant
If the surface is rough after those steps, you may need to machine polish or wet sand (or event repaint).
Good luck!