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All my answers..
I occasionally clean mine, the only time it really needed it was after the bushfires went through our place two years ago, the smoke left a light haze on the corrector. I remove the corrector, remove the secondary holder and with the corrector on a felt base, clean using a straight motion, inside to outside with a soft cotton ball and some of the Bintel solution.
Collimation is not difficult, I do it at night with the scope properly cooled and pointing near the zenith. Usually star images tell the tale, if it is a little off, bright stars loose that "just so" sharpness and look muddy, same for planetary images.
Connecting a guidecope, I deforked my CPC925 and fitted a dovetail, probably the simplest method to fit a guider would be to fit a second dovetail bar to it and use dovetail clamps or similar to mount it.
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