Quoted from mbott1701:
You'll likely still have to do something to get new ones shiny, too. They'll clean up faster, but they won't come polished. At least that's been my experience.
Yes, this. My suggestion above will get them looking nicer, but not minty fresh.
Note: Making one part of the pin too shiny can start a cascade effect where you want/need to make it all shiny
With these classic pins, unless you're trying to restore back to "Collector's quality," it's all about making things better but not perfect. Many a person has dropped a ton of cash on a restoration only to get just a few hundred over what they bought it for originally. So, spend your money where it matters most without taking a bath when you move on to the next pin.
My philosophy is to fix things in this order:
1) Things that affect gameplay (rubbers, flipper rebuilds, making sure coils are what was originally spec'd)
2) Easily remedied items on the playfield (cleaning/waxing, cracked plastics/starposts/etc)
3) More difficult items on the playfield (cracked standup targets, issues with inserts)
4) Cab or backbox cosmetics
But, most importantly, have fun!