I tried alcohol and lots of cloth / paper towel rubbing. It works some but very arduous and time consuming, it just doesn't come off easily. After about an hour of this I wasn't halfway through and needed to brake. Also tried mineral spirits but i...
Agreed, Cannon needs to be flogged. I have the exact same issue. Binoculars are used sparingly, jept in a cool dry place, and got this gooey surface now!