Also Remington blitz cloth will remover fouling including metal, quicker than just solvent and a patch. Don't use it on blueing tho as it will remove it if used very hard.
It absolutely does work.
I first heard of it in a letter published in American Rifleman about 25 years ago, when Scotch-Brite pads were new and scarcer than virgins at the Clinton Library. I had just bought a Lewis Lead Remover and as soon as I found some Scotch-Brite I started using that. The Lewis Lead Remover worked, but was a PITA. Anyone want a 25 year-old lead remover used only twice?
Takes lead fouling out of shotgun barrels too.