Repair scratches on wing mirror casings
Let's go - step by step
Apply pre-paint degreaser wax remover solution to the afflicted area to remove the wax from the your car's paint, as well as the paint from the other car.
Clean out the scratches with your Dremel 8200 with Dremel EZ SpeedClic Detail Abrasive Brush 473S. It is best to use a speed of 15.000 RPM.
Mask up around the affected area with brown paper or newspaper, then spray on primer, before spraying-on your factory colour-matched automotive paint to the affected area.