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Sometimes the CEO dries in small patches which are hard to remove except with lots of running water and finger rubbing. Do you have hard water? Or scratches create small circles. I have only experience with Pyrex.
My problem is I still have TDE on my small f4. The straight lines are creeeping toward the edge but I will be 100 before I finish at this rate. Perhaps I need to go back to fine grinding 600 or polish with with pads on the glass tool to get spherical. There are many conflicting techniques.
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