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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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