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					Originally Posted by mariusgmioc
					
				 
				The first one is a Japanese Tanto. Have no idea about the second one. 
 
For cleaning, in the first stage, I would use WD40, White Spirit and a hard brush for removing the gunk. 
 
Good luck! 
			
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 Thanks, i now have a follow up question - I can see areas on the tanto where the bare metal is showing - is this what I need to get back to, or could there be paint or another layer of plating under the greeny gunk?