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Thank you Somnium,
The mirror was a little more than dusty, moisture had somehow gotten inside and condensed, leaving what I thought would be some unwanted water marks. Using a moistened eyeglass cleaning cloth, I gently wiped away the marks, using only the weight of the cloth. It seemed to work a charm, but my first thought when I couldn't focus was that I had left some residue or even scratched the surface of the mirror.
I suspect I am destined to open my wallet and upgrade to a more capable, and therefore, for the longer term, more suitable telescope. :-) (I do want to take pictures eventually)
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