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The romo might need some evapo-rust if the gunk does come of with a plastic pad. Wd40 and 0000 steel wool might be good too. Getting nicks out of the edge will definitely take some time. Just take it...

That's a good idea to practice with the newer one. However it can be difficult to learn to straight shave and hone at the same time. I would recommend sending one or two razors to get professionally...

Welcome to the forum. What kind of razor did you get?