"I'm one of those folks who would never consider shooting anything in to the guts of a fine double action revolver"
Gun Scrubber is hardly an extreme action.
When you're dealing with a Colt, the FAR more extreme action is taking the damned thing apart.
"My Models 17 & 686 are of '88 and '89 vintage respectively, and neither have seen a drop of anything inside the lockwork nor even been cracked open."
Wow.
I don't even want to know how you deal with you car!