Mike H Mottler posted:Another method for cleaning the metal wheels on O-gauge locos and train cars ...
Use the small metal brush accessory chucked into a hand-held DREMEL tool and lightly apply it to the wheels all around. This will remove the stubborn black gunk from the wheels without using messy chemicals and will produce a polished surface.
Definitely lightly. Wear eye protection. I was cleaning stubborn wheels once and too much pressure results in the metal bristles flying out and sticking in yor skin and clothes like tiny knives!
