For me, paste wax (Johnson's - the yellow can) has been very effective. But, my shop is in a climate controlled basement, so that may not be sufficient. I've also used Boeshield T-9. It's a little more expensive, but it works very well. There are some other commercial products available too, like Topsaver. You can get this at the woodworking stores and/ or online.
I suggest you start with paste wax and see how that holds up. Any light surface rust can be easily removed with some steel wool.