there is a company that makes a liquid designed specifically for it... I can't remember the name... I can get it tomorrow...
And over on H-T there is a homemade recipe that does the same thing...
I THINK it's vinegar and simple green... but don't quote me on that.
Oh and having said all that...
If it's only a stip and it's all semetrical and on both lenses... chances are it's designed into the light... take a pic if you can so we can see what you're talking about.
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I am an A$$hole... take anything I say to heart at YOUR OWN RISK...
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