A little more than one week ago, I cleaned both mirrors since I had the telescope disassembled for other repair and modification work. It was my first time cleaning the mirrors; the scope is approximately nine years old. I mostly followed instructions I previously read on this forum.
I soaked both mirrors in a tub of distilled water with a small amount of dish soap for one or two hours. A few times I swished the water and soap around with my hands or gently rocked the mirrors back and forth, to get some motion. But I did not touch the reflective surfaces at all. I then moved both mirrors to a clean, empty tub and rinsed them with two gallons of distilled water. I then used a hair blow drier on low setting for a minute or two to expedite drying.
Next is where I think I made a mistake. I noticed a few spots remaining on the primary mirror. I used a clean microfiber cloth over the end of a q-tip and blotted the spots with rubbing isopropyl alcohol. That is when these spots or blemishes first appeared. I immediately re-rinsed the mirror with one additional gallon of distilled water. These blemishes are not always noticeable; the light has to be angled just right, as well as the angle of my eyes with respect to the mirror. It does not appear to have adversely affected the reflectivity of the mirror. The scope remains disassembled due to delays in completing the other work on the scope, so I have not been able to use the scope since my cleaning experience.
Have I done any damage to the coatings? Is there anything I can do to minimize or repair that damage? I am wondering now if I really read to use denatured alcohol rather than rubbing alcohol?
Here is a link to a photo in the CN photo gallery:
Any feedback you can give will be greatly appreciated! Thanks much!
Edited by proud uncle, 06 August 2014 - 10:41 PM.