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I can only agree to what people say here: little bit of dust doesn't do any harm and doesn't affect your observing in the slightest. The most horrible thing you can do is overclean your optics, it might damage them more than provide any benefit.
I also wouldn't recommend to shine any light directly at your mirror, you're always gonna find something. As long as it looks good down there in the telescope, it will work well.
Sebastian
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