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			 Only the smallest scracthes can be removed.   The deeper ones are very difficult to remove. 
		
	
		
		
		
		
			If they are inside the tank with water filled it might not show. I removed a small scratch from my Osaka front glass and it worked very well, no trace of it anylonger, but it was not deep. I used cerium oxide. It is a brownish powder that you mix with a bit of water and then you rub it on the scratch. It takes quite a bit of time and lots of as you say..."elbow grease" ![]() I bought mine off ebay. Do a search for cerium oxide. 
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