Yes, you can remove the mirror and clean it VERY GENTLY since you can easily scratch the coatings. I use mild soapy water and rinse and rinse. If you get smudges, lightly apply some rubbing alcohol, but go easy.
The trick is to remove the mirror with the cell as a unit. If you loosen the wrong screws, all you will do is loosen the mirror in the cell, which can then drop out. On the back of the scope, the cell bolts are usually the ones threaded all the way in. These are the ones to remove. The adjustment bolts are the ones that appear to be only partly threaded in. Don't touch these.
It may be a tight fit, but I think these are the right screws. Cell attachment screws are usually located on the side or back and are usually flush.
Large knurled screws usually indicate adjustment screws.
I'd visit a local astronomy club. Astronomers are helpful folks and you'll probably have several volunteers to help.
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Joanie (Jne) K
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You can have the mirrors re-aluminized - something you will eventually have to do with all reflectors - but it is probably not cost effective to do so on an inexpensive reflector.
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