You can try soaking it in ATF and see if that works. Remove any rubber o-rings you don't want to swell up and become useless. Also get a gun cleaning kit that has the brushes for 12 ga shotguns. You could also try putting it in a dishwasher. If all that fails then anchor the parts to the ground and use a powerwasher. If that fails then I don't know what to tell you.
Courage is being scared to death, but saddling up anyway. -John Wayne
Corporal Dunn: [scared] What the h*** are we gonna do now, man? Russians got us outnumbered, s***'s falling from the sky. We're screwed, man! We're totally...
Sergeant Foley: Shut up! Get a grip, Corporal! Our weapons still work, which means we can still kick some a**.