Here's my late father's 686 no dash that was bead blasted somewhere around 1990, I inherited it in '92. It's been shot a lot with both mags & special.

My routine started out with Hoppes No. 9 & a brass brush, later changed over to MPro 7 & nylon brush, then finished up with the Birchwood Casey lead removal cloth on the front of the cylinder & under the topstrap to finish up the carbon clean up. No shiny spots, this system works great for me.