When the close-tolerance triggers used by benchrest shooters get fouled with a single grain of powder or sand (Yes, those triggers can be that finicky.), those guys have been known to fix it at the range by flushing the trigger with lighter fluid. I've seen it done more than once.If you are not pulling the sideplate and grips, just how well are you really cleaning it?
I think it's possible to do a reasonable job of internally cleaning a S&W revolver by flushing it with the right stuff. If it isn't possible, I'd sure hate to look behind the sideplates of most of my revolvers.