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How do you clean refractor diagonal?
I have successfully cleaned the main and secondary mirror in a reflector several times with never a problem. Now I have one of these refractor telescopes with a 2" diagonal at one end. A little dusty I have dealt with a blower no problems. Now I have some water residue from dew but I dare not touch the surface.
What is the the accepted safe way to clean a refractor diagonal? I am thinking of gentlely flushing with filtered/distilled water but a little worried about what that might do to the insides of the diagonal housing! Anyone with some tips?
Thanks... Ken 
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