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Same problem with my Beretta A400. I listened to people about using different combos to dissolve the junk and did a test. Chopped the junk off using a wooden pick and put in a jar. Then added all of the stuff that was supposed to dissolve it and weeks later, guess- none of it was dissolved, same little chunks of gunk. I wonder how an ultrasonic would work. What I do is pick at it with wooden picks and don't sweat it too much as the gun keeps working no matter what I do.