Be careful with it overall--vinegar WILL remove bluing---not sure if it will in conjunction with Hy. peroxide, but vinegar had been my go to for removing bluing for a few years now.I've bought a HS M-102 Trophy with the 8" barrel and muzzle brake. Apparently the original HS tool for removing the lead build up in the brake is long gone. The gun is in transit to me right now so I haven't seen the lead build up in the brake but the PO said it was substantial. Bullseye shooters on another forum have stated that they use a 50/50 mixture of Hydrogen Peroxide/white vinegar. It sounds ugly. My question here is has anyone ever used this combo - is it safe to use this mix and will this be harmful to the finish let alone my few remaining brain cells.