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For cleaning the etching on the blade, stampings on the tang and jimps, I use a brass brush, tooth brush type (paint dept Home Depot) with the WD40 then some metal polish to remove the rust and gunk....

I would spray it down with WD40 and with a single edge razor blade to cut off all the rust and crud from the blade. A wooden coffee stir stick and a paper towel will get the soap and gunk from...