Cool pattern on those duallys... I have never cleaned the outside of my Bronze 18650, and with the exception of a couple greenish blemishes it doesn't have much patina, the Brass Micro was cleaned once, it gets a bit dirtier than the Bronze.  I do clean the contacts on all of them regularly, got to keep them hitting strong!
	
		
			
		
		
	
			
			 
				
		 
 
		 
 
		 
	 
	 
	 
	
 
 
		 
	
 
 
		 
 
		 
	 
	 
	 
 
		 
 
		 
 
		 
 
		