Larry:
If you've got the gun to bits, then ultrasonic is best. If not, good old automatic choke cleaner works well. Spray the heck out of all the crevices you can find, scrub with a toothbrush, etc. and let it dry for an hour or so. Then spray with WD-40 and let the excess run out (down) overnight. Wipe the remaining off, then lube the bolt and other moving parts with a Q-tip and LSA oil. Heavy grease is not the way to go. It will catch and hold all combustion crap and gum up your gun.
Best, Kensal
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