Lens pen not a good idea...
,,, at least not for mirrors.
Mirrors used in telescopes have the reflective coating on the outside, unlike most with a layer of chrome or similar under glass.
This coating is usually aluminium, it's very soft.
Even the gentlest of brushing will damage the surface. Some people suggest rinsing under flowing distilled water, which will remove any loose dust particles, even going as far as drawing a soaked cotton ball over the surface as you rinse.
Distilled water is best because tap water contains othe elements which can damage the surface.
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