I use Birchwood Casey Bore Scrubber with a drill chucked rod for deep cleaning of bores. It has always been my impression that this stuff is more a wetting agent to facilitate scrubbing and lifting of crud than a true volatile solvent and I have no fear of its effect on solder. Follow with patches on a plastic jag....I like the rather new compressible plastic jags as they get a better surface to surface contact, including passage through the choke area, than a metal jag.
I do use BC Gunscrubber (very much like brake cleaner and definitely a volatile solvent) as a solvent to clean crud from trigger groups, etc but I am very careful where I get it. Generally spray, blow off with compressed air, then a little lite gun oil, blow off with compressed air, and the little bits are good to go.
I like BC Sheath (they rebranded it lately and I can't remember the name off the top of my CRS brain) for all outside metal surfaces as a rust preventative.
