I use 2 things (most of my stuff is stainless) but I have worked with carbon here and there and more often recently. So I use barricade spray when I am working on the knife any time I put it down or over night I use that as its a quick spray and wipe. Then when the knife leaves my shop for a new home I put a coat of renaissance wax....the links below show what I use. The baracaid I have found doesn't last as long as the ren. wax that's why I use the renwax when it leaves my shop. I even put the ren. wax on my stainless blades just for good measure and most of the time even the handle get coated
Barricade--
http://www.knifemaking.com/product-p/bcps8.htm
REN. wax----
http://www.knifemaking.com/product-p/rw065.htm