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Depends on the problem and the surface.
Many Telescope Lense manufacturers recommend just a rocket blower and resist the temptation. Do not dry wipe. Camera lenses seem more robust coatings but I still think the Giotto liquid lense cleaner is better than a dry wipe.
Or if very bad dew spots, rocket blower and Giotto type lense cleaner on pure natural cotton wool spot clean the sappy spot and then from the centre to the edge in a circular motion if still required. Less micro scratches is the aim which all cleaning creates over time.
If very very dirty and effecting the star image after blower use high grade (pure with no water) isopropyl alchohol with pure natural cotton polished from the centre to the outside wrapped around a cotton bud thrown away after each pass.
Mirrors on edge use running water if possible or a few drops of QV emulsion soap with fingers in water or many pure cotton wool swabs where impossible to immerse then more running water and then litres of distilled water. I am not sure about alchohol on mirrors and definitely not mirrors with attachments unless it is required to spot clean fungus. Less wearing down of the coatings is the aim which alchohol can advance unless the mirror is coating protected and alchohol is recommended . Sure cleans any hint of fungus on an old mirror though and can be diluted on those.
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