It's nothing a permanent 40w light bulb won't cure, and WAY cheaper (and better) than those rods.
We have 95* and 95% here in NC in summertime.
Just make sure when you wipe down, to store muzzle down, so gravity pulls it outta barrel and away from wood.
The internals or wood-to-metal areas get the oils and gum up or soften wood fibers.
Put an old sock/rag to absorb.
Shootingly,
John--ye olde gunsmith