If you don't have a Dremel tool, Jewelers Rouge will be of no use at all.
It is used on hard felt buffing wheels run at very high RPM.
You can do a passable job of ramp polishing with fine black Wet or Dry paper, say starting with 400 grit, then 600, then use red Crocus Cloth. (it is coated with Jewelers Rouge)
You can find it at any hardware or auto parts store that sells paint supplies.
Wrap strips of the sandpaper around a small wood dowel and gofer it.
Use care not to remove metal from the ramp and change it's basic shape.
BTW: Bent recoil springs are par for the course with these little guns.
Even if you replace them with new springs, they too will be bent after shooting the gun a few times.
The reason is, the springs are almost completely "stacked" or coil bound when the slide if all the way to the rear. They puts enough strain on the coil windings that some deformation of the springs occur.
Bottom line is, don't worry about it.
That's why there is a recoil spring guide rod.
rcmodel