yes, the tiny dirt particles din into the paint and scratch it off
if you scratch your brown eye with your hands are dirty as poo, you dont scratch your brown eye with your foot point proven
Scratch them with your 80,000 dollar car
If it is a shallow scratch, then you can use an item such as Scratch Fix 2in1.
I get scratches and dents when I leave my car in a parking lot and people fling their car door open. A deep scratch or dent can be created at snail speed.
Try: NOVUS PC-20 Plastic Fine Scratch Remover or Quixx Paint Scratch Remover All the best
I would think its because the dirt can get into tiny crevices in your skin and since its uncomfortable you scratch at it to remove it.
That depends on how dirty and what car it is
If it is a scratch in the paint there are touch up kits available from a car dealership's parts department. For a dent and scratch add some dent filler to the touch up kit to fill in the dent.
from the oil and grease