Hi Greg, yes, Do Not use any window cleaning agents or any other chemical cleaners of any sorts on a telescope Mirror/s until you find/read/research with in astro community and here IceInSpace- ?
What telescope do you have, I only ask as you are quite new & it will very well help others to respond to your question ..
I have had a quick look through & nothing popping out as to mirror cleaning, yet, but below are two 'links' on cleaning lenses, do not use these cleaning tips on Mirrors, mirrors are totally different ball-game
1)
http://www.iceinspace.com.au/forum/s...d.php?t=149868
2)
http://www.iceinspace.com.au/forum/f...splay.php?f=20
Have a good look through the Forum, and or Google Search something like - Astronomical Telescope Mirror cleaning !
Rgrds