There are areas of your paint's finish that see more abuse than others; on the edge of doors and the trunk lid, around the door handles, keyholes, at the hood latch, etc. What you need is a scratch remover. MOTHERS® has the best. MOTHERS® Scratch Remover works on any sort of paint, any sort of finish, to help restore high mileage paint and remove surface scratches. This is a true polish--be sure to chase it with the standard regimen of waxing to properly seal and protect. (If you can catch your fingernail on a scratch, then there's a chance it's too deep to polish out completely. The appearance will be vastly improved, but the scratch may not go away. Polish the scratch in a variety of angles opposite to its direction.)