"Bag Balm" is popular on my fire crew where we regularly go 14 days working in 100F temps in the same clothes. Comes in a green cube-shaped tin and is made for cow udders. Never used it myself, but heard it's a ~1 day cure. I'll second the baby wipes for daily "maintenance". A commando coworker used these...
...and if you're a fan of dark beer, espresso, and dry red wine go for Gold Bond in the BLUE bottle...potent!