White Diamond polish:

http://www.whitediamondamerica.com/

You can buy it at most auto parts stores in the polish/wax section.

Titan

I don't polish pinballs. Especially if they're used ones. Used balls will simply wear down a playfield. And if you tumble them, they will not come out perfectly round.

Wipe off the oil, put a little wax on them, and you're ready to go.

A lot of folks like the balls from pinballlife.com (when they are in stock).

Buy rubbers and pinballs from Terry at PBL. When the pinballs get scratched and dirty, I put them in my gum dispenser.

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I polish by placing an order to Terry for new ones

A cotton buffing wheel on a motorized grinder, Flitz (if you don't have Diamond), a good strong set of leather gloves with rubber grip, and ten minutes available per ball. Balls will come out quite shiny, unless heavily scratched initially.

Skip the tumbler, if you want a controlled finish in a much shorter time.

The only further requirement is personal boredom.

$0.75 a good ball (bought in bulk) is generally worth the cost.

Mine get polished when I throw them in the garbage.

If the ball I'm using isn't scratched up, l simply apply a little wax and play, otherwise replace.

I use Autosol chrome/metal polish. I have set up my drill as a polisher (clamped on its side) with a cylinder polishing buff you can buy at any auto store. It takes me a couple of minutes to get an old ball to look like brand new.
When polishing I let the ball rotate slightly between my fingers to get an even finish.

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