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I am not 100% sure how this applies to your scope but I thought I would post anyway.
I have a CDK17 truss. I can lift the lycra scope shield off and poke my head up into the scope.
I angled the scope down so any water runoff would flow out of the tube onto the ground.
I got a garden sprayer and used filtered pure water. I first blow the mirror with a hurricane blower to get rid of any loose grit.
Then I sprayed the mirror thoroughly and pumped up the sprayer so it had a bit of pressure.
I then daub the mirror gently with tissues and change often to get rid of grit etc.
Then I wiped it dry gently with white unscented tissues and lots of them. Don't wipe hard, don't wipe very far. Turn the tissue over and change wipes often.
That cleaned it up nicely. In my case and commonly, the mirror has a silicone 2 overcoat and is quite tough. You are not acutally touching the mirror coating. These GSO mirrors though are a plating so you'd have to check how tough they are and if they are easily scratched.
In the past I have done a wash like that and then Bintel cleaning fluid (its really good) and lots of tissues.
Only clean when its really bad. A bit of dust doesn't affect images much.
Greg.
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