Glass-fibre pencils?

[RobertInOntario]

Rob
I have one; I've had it for decades and I'm still on my original fill. I use it when I have a stubborn lump on something. Lately I seem to have used it on items that have had batteries leak in them. Also on metal items to finish the surface before painting, especially cast kits.
The local MicroMart dealer usually has them. Lee Valley might also. MRI used to stock them.

Thanks, David. So it sounds like they can be used for many purposes, especially cleaning up old flashlights! Are they good for cleaning grunge off old track, especially brass track? I think this is what some of those articles have mentioned. Rob