I have used the peroxide,white vinegar mix (50/50) for many years with great success. I only use it on stainless guns. I have shot 5-600 rds of lead before cleaning completely and the carbon and lead buildup is terrible but I soak the cyl. and bore in this mix (10 minutes) and it pretty much wipes off. It also seems to help if the mixture is fresh so I buy it in small amounts when I need it. I have read where some people believe it could do damage to the gun, and I'm no metallurgist so I'm not going to debate it w/them. I have a 686 that has been done 40-50 times and see no ill effects, and will continue to do it.