Brass wire brush; the wires are not magnetic and can do much less damage if missed anyhow; being much softer than steel.
Dremel also has stiff plastic brushes that along with solvent, work ok too.
Some locos cannot be operated upside down or may be too delicate for an inversion in a cradle. (foam cradle? still a maybe)
I like the "set it and forget it" aspect of the rollers w/abrasive pads too. I can check back every few minutes to remain lazy....lazier?
ScotchBrite is great if they aren't gunked real badly (see "scrape" above). (I've bought some cars that looked like smooth steel at first; but it was gunk thick enough to peel off like a tire. (thicker than any tire, lol))
After ScotchBrite, you'll only need a mild touch up with Q-tips, mostly to remove dust and gunk from pits and some other low spots."The finishing touch", figuratively and literally.
I DO use a cradle, jumpers, and 1033 but I know my stock allows it ...after the pantographs come off anyhow 😉 The rollers sure would be nice for tests and lubing too though (Spinning the excess oil to the wheels outside edge vs sitting on a rag for hours to let gravity do it, sounds good to me.. even if it is only the powered wheels that it works for, they'd see more oil and cleaning)
Just a note, oil cleans pretty well alone. When I lube, I also wipe the wheels down at least some, face and backside too. That tiny bit will protect way more than it effects the traction; a worthy trade off.