When a gun gets wet, I dry it.
I do to, if I can. But thats usually at the end of a 12-14 hour day, and the gun is holstered and being worn the whole time. After I get home showered and eat, its right back on until bed.
Oh I rotate holsters, and they are all good leather, maybe that helps too.
The last leather I was using regularly in the summer were a couple of Galco Royal Guards. I usually ended up buying a new one each year, scraping the worst of the two I was wearing every day. The one kydex I bought to replace them, lasted 10+ years of daily use, and I still have it, and its still as serviceable as the day I bought it.
I was using a Milt Sparks VMII in the winters for awhile the past 10-15 years or so, but not much anymore, as I made the switch to AIWB.
But put one in the gun cabinet un-oiled in Washington state....
Not any different here, especially in the summers. This is where the right finishes make the biggest difference. Glocks Tennefer, hard chrome, etc, are pretty much impervious to things blued or parked guns rust at just thinking about it. Things likely to rust, do benefit from products like Eezox, which Ive had real good luck with, with guns not carried, but still exposed for long periods, like n vehicles and damp places.
