I have something in my center that has resisted cleaning. I’ve tried several times and it just won’t come off. It has been there for years and is only visible with open sky pics as it’s in the top left of the screen. It could be a tiny scratch. Tried again yesterday and no luck. I out a significant amount of pressure and went over it several times and it is still there. I may take it for a pro cleaning at Hunts. Or I may continue to ignore it. anyone have any experience where YOU couldn’t get it but a camera store person was successful?