Aloha!

Everything metal corrodes or rusts in Hawaii. Unless you have central air, you do the best you can to keep metal objects rust/corrosion free.
Most condos and apartments do not have AC since you have trade winds that keep things moderate. Plus electric is very expensive in Hawaii, so running AC is not a cheap proposition. All of Hawaii's electric comes from Oil that is shipped in from the mainland. You pay dearly for this. So the humidity is high being a tropical climate, and the salt air aids in fast corrosion or rust. My Condo is on the water and I swear the breeze picks up salt from the ocean and blows it in the condo. The best I can do is to keep air moving. Fans are the order of the day. Every room has a ceiling fan that runs constantly, and the windows are always open to allow trade wind to blow through. Master bath and my bath both have a window and a power vent.

Most of my showers are cool showers when it's 85 degrees or more, or warm showers when it's 75. No steam in the bathroom. Hot towels on the face for prepping the wiskers for shaving. It seems the more you use something the better off you are. I have used Parafin oil on my straight razors with success. Any better alternatives I'm all ears.

-Zip