Nitric acid is faster Marco. 
 
But jokes aside, citric acid works well, I've used that too, and a lot of people in Indonesia currently use citric. In fact anything acidic will clean a blade, its just that I prefer vinegar because it is cheap, easy, consistent. 
 
But if I could still get decent pineapple juice, I'd still be using that.
		 
		
		
		
		
		
		
		
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