Start with breech submerged in hot soapy water, nipple removed, of course. You need to flush the flash channel with moving water. be sure the breech area is full of hot soapy water; if you're not sure submerging the breech accomplished that then pour some down the barrel. A cleaning jag of the proper caliber on your ramrod and a cleaning patch will work as the piston to force the water through the flash channel. Work the jag/patch up and down in the barrel to get the water moving back and forth in the flash channel.
If the hot water 'douche' is ineffective an alcohol solution might work. The last thing I'd try would be a rust remover such as Liquid Wrench or Kroil.
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