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Old 14-07-2020, 05:51 PM
Saturnine (Jeff)
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Saturnine is offline
Join Date: Jul 2008
Location: Wollongong
Posts: 1,527
Hi Again

From the sounds of it the mirror is clean enough and it was just a very damp, cool night causing the mirror to fog up. If you have similar conditions fairly often , it may be worth considering dew heaters for the secondary and maybe the primary as well, but sometimes even though the sky is clear other conditions will spoil the night.
If you really must clean the mirror, there are plenty of tutorials online and even written articles in the Beginners section of Projects and Articles, up in the top left of the home page.
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