Style chooser

do u know when something scrape against your car, in my case, a gate. and when the gate scratches against my car the gate's paint tend to get on the car?
(my car is black and now there are some silver paint scratches on my car, the gate is silver in colour)

i'm not sure if the marks are because my black paint is scraped off, or its just the gate's paint which got onto my car which can be removed but it's worth trying, what is ideal to remove the gate's paint marks on my car?

thanks in...