I got a great tid-bit for you Pearl White guys.
I had tried and failed to open a business that was a patented scratch auto-repair business. I never got enough cars to keep me in the green and I sold it.
My tip for white cars, 90% of scratches are embedded dirt so long as we are not down to the gray primer. Take some lacquer thinner on a rag and clean the scratch, most all will disappear. Most of what you are seeing on a white car is the dirt or paint transfer from whatever you hit like a mailbox or something.
No, the thinner will have no effect on your factory paint but wax the area afterwards, it will eat any wax that is already there. I have tried this, it works!