[mapsjanhere]

Remove the surface rust beneath the grips with a green scotch pad and some gun oil. If the scratches on the frame are deep enough to distract they're most likely also deep enough to make polishing impossible. A stainless finish is easy messed up, you're more likely to damage the finish beyond repair than improving the looks by getting the scratches out.
And I agree on the springs, leave them alone until you shot the gun for a couple hundred rounds. If there are functional issues after that you can look into getting different springs, but they are not a routine maintenance item.