[m11 (Mel)]

Hi All,

I tried to clean my secondary mirror with isopropyl alcohol which investigating further is the probably the wrong stuff to use.

Would like to ask for advice regarding my dobsonian secondary mirror in that I have noticed indigo swirls on it? Have I killed the coating and is it worth getting it recoated? Is the recoating not worth it and I am better off getting a new secondary mirror?

Thanks,

M11