I agree with all the previous comments, BUT..............I have washed the mirror a couple of times using different techniques explained here and elsewhere. The result was very little change.
I also used the spray on (peel off) cleaner used by professional observatories, again very little difference between dirty and clean.
Whilst the views with this mirror have always been very good, I feel that the original coatings (the scope is just over 4 years old) are deteriorating.
This could explain the lack of visual improvement, when cleaning.
I'm open to suggestions.
As a mirror maker, what is your opinion Mark?
