I have to keep my reloading equipment in the garage which sees all sorts of temperature and humidity swings. Other than hosing them down with something after use and then cleaning them off before using again, is there any sort of corrosion preventative that works?

I don't know about any permanent coating, but I shoot them with a little bit of barricade before putting them up. I generally don't worry about cleaning them off before I put them to use.

any light oil will do it.

I use VCI squares from Midway in all my die boxes without rust.

+1 on the Barricade, I have also used the VCI squares. Years ago RCBS dies came with a rust preventive disc in the box.

I'm in the same situation, all my reloading stuff is kept in a wooden shed behind the house. I just spritz them with whatever light oil I have on hand at the time, even if it is WD-40. Remoil, Barricade, anything works really.

I store my dies in a drawer and stand the die boxes on end so the labels face up. I also set the dies in the box so they are in an upright position when stored so that oil does not pool in the die cavity. Been working so far. I don't bother cleaning them off when I pull them out to use them. About the only time I ever clean the dies is when I may have some cast bullet lube build up in my pistol dies.

Clark, spray them w/Kroil and you won't have any trouble. powdr

Thanks for all the suggestions guys.