Just keep her wiped down. If it rusts it should be able to be cleaned up with a little oil. Just keep an eye on it.
No, no, no, wait, give it to me, I'll make sure it don't rust.
I'm afraid of the same thing with my model 38.
Ya know, it's funny...my model 38 rides in my sweaty ol' pocket every day and it doesn't have a speck of rust on it anywhere!
What's even funnier is that the only part of the model 13 that I'm really worried about is the grip. The rest of the gun is fine...it's that damned grip that always rusts on me.
I guess that's why I don't worry about my model 38 rusting...it's got an aluminum grip!