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		 Maybe just scrub it with a stiff brush and soap. 
I used transducer paint from West marine. Its a small bottle with a brush in cap.  I painted all the brackets around the transducer too. 
Seems to work fine, so far.   
I dont see any build up on the visible (top) portion of the transducer.  It s a transom mount... 
		
		
		
		
		
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