Mkay. This may get wordy because gun solvent/lube became a major point of family contention in the last 5 years. No joke, big old arguments around each family gathering.
I had been using Hoppe's for years, and still do to clean my Revolver. For some reason, it takes grime off the bluing
better than any of the others. It's not the BEST for ALL firearms, but it does get the job done clean and fast with blued steel. Major downside: you HAVE to get all excess off your firearm, or dust and crap will stick to the leftover lube, gumming up the works. On a revolver, this is not difficult.
I do not like that Hoppe's is not very good at repelling water. If I take this revolver hunting, I will be using my next recommendation.
Back in 2000, I discovered
Rusty Duck thanks to a Black Powder hunter I hung out with. This is what I use on my pump and bolt shotguns. It dries to a slightly more cohesive grease, not tacky, and works like gangbusters to get all manner of residue out of the barrel, be it steel, lead, or copper.
I do not recommend it for automatic pistols or rifles, because it tends to attract residue from each shot fired, resulting in gunky buildup after 300-400 shots. It also does a SPECTACULAR job of repelling water - and shotguns are my most likely weapon to be out in a lake, or the rain, or what have you. If you just spray on/wipe off a sheen of Rusty Duck, you can damn near dunk that firearm in a pond, and pull it out, then leave it be for days - there will be no rust.
Finally, for all my semi-autos, CLP. My uncle nearly throttled me for waiting to try this lube/solvent/cleaner/wax/polish/condiment. I bought a can finally in 2007, and I gotta admit, he was right. None of my autos are blued, and the CLP does a great job cleaning steel and chrome. It also leaves behind a thin, thin, thin sheen that lubes an auto up nicely. Finally, it does not seem to attract dirt at all.
The only beef I have with it is that, once again, it doesn't do nearly as good a job waterproofing as Rusty Duck. I had a S&W Sigma .40 for a while, and solely cleaned it with CLP. Went shooting with some friends one day, left the gun in its holster in my trunk, and a jug of water leaked all over it - as well as my Winchester 20 ga, which had been treated with the Duck.
The Sigma had grown some spots on the inside of the slide the next day. The Winchester was still flawless.
But I did often put 300+ rounds through that Sigma on a regular basis (until I got sick of the damn thing and sold it) at the range, and CLP never gummed up. It also works great on my wife's MK I Hi-Power, my SKS, and all my friend's firearms.
Frankly? I just keep all three around. If I absolutely HAD to decide on just one, it would be the CLP - but I'd still be on the lookout to acquire Rusty Duck.
ALSO!
Rusty Duck makes WD-40 look like kool-aid when it comes to getting corroded metal unfrozen. I used it on a powered gate chain in my backyard that had frozen absolutely solid for about thirteen inches. Spray, tap with hammer, spray again, leave it be for an hour. When I came back, that chain cracked back into flexibility no prob.