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I've used a big blower and packets of camera lens cleaning tissue and lens cleaning liquid they sell in local photography shops without any issue cleaning eyepieces and some telescope objectives.
I later bought the Orion lens cleaning tissues, which are a bit softer and the Orion lens cleaning liquid. That worked fine too.
For cleaning the front element of an SCT, Celestron recommended using Iso Propyl alcohol (not the type one rubs on sore muscles, but the other type) and I used that with lens cleaning tissue, and that worked fine too.
Regards,
Renato
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