I've found brake cleaner can be a little deceiving in cleaning the weapon. Most lube oils (especially CLP) lifts carbon and dirt our of pores and off the surface and suspend it in the oil. The brake cleaner dissolves and carries away the oil, leaving the surface dry, so running a patch, rubbing with a finger, etc you don't see any dirt transferred to the patch/finger tip.
So, you oil the weapon back up, and the next day if you were to run a patch/rub with a finger tip, you'd find lots of carbon/dirt on the patch/finger tip. You can't beat scrubbing and wiping to get the dirt out of the weapons nooks and crannies and out of the pores on the surface of the metal. NOT saying brake cleaner doesn't has it uses, NOR it won't clean at all. NOR I'm saying that you must pass a white glove test after cleaning. BUT, personally, I've found it won't get all or most of the carbon/dirt out of a weapon, you have to scrub/wipe to do that. It will dry the metal out, and prevent transfer of carbon/dirt while dry, to make you "think" the weapon is cleaner than it really is, so just be careful of that.