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Great this is what it says on their web site, I'll give it a try.
GUNS
Clean disassembled gun parts in a 1-part Simple Green to 1-part water solution. Rinse completely with warm water. Dry thoroughly, being sure to get any remaining moisture out of blind holes. Immediately follow up with a protectant and/or lubricant to prevent rusting of metal gun parts.
What solvents are you using to clean out the rings in your revolvers?
I've tried soaking them with Hoppes 9 and Tetra Gun and then brushing them but neither one of these solvents seem to work well.