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I only use visual and imaging newts and clean my mirrors once a year in a similar way but my scopes are only 2 to 4 years old
I wash the mirror in the kitchen sink with warm water to wash off dust and grit, then a drop of dishwashing liquid and a cotton ball wiping gently in a circular motion for 20 sec under the tap. Then rinse off twice with distilled water
Tilt mirror to let most of the droplets run off then remove and tiny drops carefully with a Q tip. Leave to dry in a cool place for an hour then re install
That mirror of yours looks in poor condition !
Alex ( mentalastro ) a member on IIS has a lot of experience with newts and mirrors etc... maybe pm him for his advice ?
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