Smith & Wesson | 422 | e-GunParts.com
Since it's not broken, I'd just remove the slide / magazine and grip panels. Take Break free CLP and soak it good all inside, then use compressed air and blow it off. Then use a paper towel and finish wiping the outsides off.
Your dealing with pins and springs that possibly should not be fooled with. Using CLP with compressed air makes cleaning dirty 22s childs play.