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		 I am going to try this on-off stuff I hear you guys talk about.  I had my boat in the boatyard for a while and some it had some VERY serious bird crap(cormorants I think)  all over the boat. It dried and I had my son hit it with a hose and water and boat soap.  Well it turnned EVERYTHING it touched BLACK.  Like ink. I was in the glass I tried everything (and a full day of scrubbing) I had and got some of it off but it is still grey in places. I am hoping it wears off.  That was the worst stuff I have ever seen on glass. 
		
		
		
		
		
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