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HI Ezy,
Rajah bought up some good points, avoid doing anything to the mirrors unless it is absolutely necessary (besides collimation). Surface dust on primary mirrors is a fact of life, you cannot get away from it, it's always going to be there.
I have seen closed tube SCT's with dust on them without degrading their performance (well not the eye can pick up) A friend of mine has an 8" f7 scope that hasnt had its mirror washed since he got it over 10 years ago. If you cover the tube and keep the telescope in a clean space you shouldnt have a problem.
If you really do need to clean the mirrors, goto your local Astronomical society and ask around for some expert help, learn from them how to do it yourself in the future.
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