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I was a big military vehicle collector years ago, and in the government issued manuals it says to clean cosmoline off with gasoline. Works good, I've done it many times. Those numbers on the cam package will tell what vehicle the cam was for. WW2 stuff is easy, every vehicle had a "G" number at the beginning, like G503 is a jeep, then the number after that tells what part it is for the jeep. The 8rt cam in question, is later than ww2, so those numbers fall in what we call "m series" which is post ww2, korean war era when they changed the number system to the NSN, "national stock number". Which will still be able to find the origin of the cam, but slightly harder to research , and if Canadian it get trickier yet. Would be fun to know what it was made for though.