I bought some Hoppes solvent last year. I have used it 3x now. Every once in a blue moon, I get a powder stain on my hard chromed P99 slide that just won't come off without solvent. But, it doesn't happen too often.
i wish i could get a sample of the stuff bf i buy....i use a mixture of stuff at the moment that cleans and lubs, i cant remember everything i put into it but it is a mixture of diesel fuel, mineral spirits, auto tranny fluid, and a few other things.
I use a copper graphite antiseize lube. Same stuff Glocks ship from the factory wtih. The graphite is a great lube, the copper in it gets worn down into the metal surfaces and smoooooths everything out. I use it on all my guns, no issues here in Fl. wtih temps from 20f to high 90s. Temps from rapid firing don't bother it, and it is non-gummy in the low temps.
Usually #9, but once on a range visit I needed to do a quick cleaning and had forgotten my lube and the guy next to me had some WD-40. I use a very light amount of that and was good to go for another 250 rds.