I had a stainless revolver that had a lot of lead staining on the cylinder face and in the forcing cone area. My LeadAway cloth is in storage. Searching around online, I found a suggestion to try a 50/50 mix of white vinegar and (fresh) hydrogen peroxide. I started with a cotton ball that I...
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Mix some up; wipe it on with a cotton ball or piece of gauze and leave wet for a few minutes. Then scrub off with a cotton ball/gauze soaked in the mixture.
A lot cheaper than the commercial cloths, and easier to get the ingredients/mixed.