For my kitchen/cooking utensils I prefer to just simply wash with hot water & soap and then wipe off IMMEDIATELY until dry with a paper towel.
I have Henckels 4 star knives & this works great for both them & all others that I've used whether good, cheap, stainless, or carbon.
*Note-Carbon knives are going to turn color (form a patina), that like alot of others here at BFC, seem to find appealing.
They will take on the look of your Grandmom's knives. That couldn't be too bad of a thing now could it?
I choose to keep most chemicals away from the food unless out in the bush. In the out-of-doors scenario, which I haven't found myself in for a number of years now, I protect the knife with honing or machinists oil (very, very light coat) and that always works fine. I suppose that now a days, I would use a Tuf-Cloth.
As I stated before, I don't like chemicals in my food, but the way I look at it is like this; if you can go 5 days without a shower then you shouldn't mind eating a little oil.
--The Raptor--