Just a note, I don't think I've ever had a trigger freeze up even in a Manitoba winter. I usually clean with brake cleaner and lube with a dry film protectant - I'm a big fan of Hornady One-Shot (not the case lube) as it flashes quickly and protects very well.
I've also done the same to Tikka T3X bolts as there's been rumors they like to have light strikes in cold temps due to live freezing on the firing pin spring - super easy to pull apart, hose them down, spray the metalwork, let it flash off, and reassemble.