Yep, thread from 8 years ago...
The 3m stuff Chuck used is a bit more aggressive than the green scotchbrite.... there are many grades of scotchbrite, note the color of the stuff on my picture of the bridgemasters unit.
Chuck alternated between 2 locations and pictured in Arizona there.
In the intervening 8 years I have had occasion to compare scotchbrite types and the drywall sandpaper, and I favor the drywall sandpaper for the reasons I have given.
I have also the experience of our 120+ member club that I am with, and for brass track, I would go with a weighted drywall sander on a pole and slightly worn drywall sandpaper.
If I had brass track, and wanted to run a car around, I still prefer the bridgmasters car...
I have an extensive page on a number of different solutions:
There's many solutions...