About cleaning/polishing, I sure can't remember who it was, but he'd used it on some cases. Like Jon W. said at the time, been aware of MMO for years but never bought any. In the vintage car world some guys worship that stuff! There's a classic photo of an old geezer "drinking" it.
Anyway, I popped for a bottle of it at the dollar store a while back. This evening I noticed it and there was a green scotch brite and a set of crankcases right there on my bench. Damn! Did a little patch and it looks great. Stuff I already been over with Brasso or something, now it looks better.
I think that was me extoling MMO's use. I used exactly as you did, with a Scotchbrite pad. It works wonders. Not quite as good as vapor blasting, but way easier. MMO is essentially Stoddard solvent, the stuff invented for dry cleaners in the 1920's, and works well for cleaning metal parts. It's a little heavier than pure mineral spirits or paint thinner, for scrubbing applications. It's touted as a miracle lubricant and additive for all sorts of applications, the original snake oil. Don't know about those, but it works pretty good as a cleaner and is widely available. You can find YouTube videos comparing it with other cleaners/solvents and it compares well.