Well, since it's a Merkur, nothing you do will stop it from corroding. Any cleaning chemical you use will be too "harsh". According to Merkur itself, getting one of their razors wet will corrode it, as will cleaning it and using it. I know some may disagree with me, but others have been in the same situation I have been where a brand new Merkur is cleaned in the same fashion as a 60 year old Gillette, and the Merkur corrodes.
I think there are four items in this world that combined can solve any problem. They are: A pair of pliers, Duct Tape, paperclip/wire, and Barbicide.