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Hi, If you haven't done so already, go into sensor cleaning (mirror up) and use a puff from a lens cleaner. Take the brush off first and give a gentle puff or two. To check if it's clean, illuminate a piece of copier paper evenly take a shot, then look at it. It should be nice and clean.
That'll teach me not to read the manual, it is all explained nice and clearly just as you described. Now I have a nice clean sensor. I had heard from others that sensors need cleaning by experts or special tools, but for this camera it seems easy.