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Hi ill put in my 2 bobs worth with respect to a 13" mirror i washed for someone .The mirror was in a telescope that had been left capped in an observatory , but on inspection was covered with condensation and some dirt. All i did was to rinse under slow running water and swab ( no pressure) with weak detergent in quadrants similar to the method used to clean a SCT corrector plate . Then finished by rinsing with distilled water followed by absorbing remaining water drops with optical lens tissue. If i had a rocket blower i might have been able to remove most of the droplets without the tissue. The mirror showed no signs of scratching with this technique.
regards philip
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