It is possible that while parking you must have bumped into an object that was freshly painted. It is possible that the original clear coat also got damaged exposing the car body to a possible rusting condition. Attend to it before more damage is done.
To remove the residue you would need
- An ultra-fine 1500-grit or 2000-grit waterproof sandpaper
- Polishing compound with mild abrasive
- A car wax
How to remove the residue:
- Carefully sand the marks with wet sandpaper without disturbing the clear coat
- Use only ultra-fine waterproof sandpaper until all marks are gone
- Try on some small spot to test
- Once the mark is gone it is possible that the clear coat has lost some of its sheen
- Use the polishing compound to restore the sheen
- Put a small amount of the polishing compound on a damp sponge
- Rub well until the clear coat starts shining again
- Buff the area with the car wax