Hi Greg
Just a thought, not actually having to resort to this method as my newt mirrors are removable and being reluctant to touch a mirror surface with a sponge especially something like your CDK17. Would be worth a try to buy a new spray bottle from a supermarket for about $3 and fill it with warm slightly soapy water and with the scope laying horizontal, mirror vertical, spray the mirror to wash the dust away, may have to do it a few times for stuborn stuff. then you can refill the spray bottle with destilled water and rinse away the soapy stuff.
After that , just let it air dry or blow dry if your wish, good luck.
Jeff
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