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They look a bit like residue from a cleaning attempt. They shouldn't noticably affect the performance of the scope, if at all, but if you want perfection get a pro to do it (unless you're feeling very gung-ho and confident or insatiably curious about how it all works.) There is some danger that you might actually make it worse of you attempt to clean it yourself. If it was a newtonian mirror I would say go for your life but perhaps not with a SCT.
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