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Hi Robin, To reduce reflections I use a 2" camera adapter with a Baader UV/IR blocking filter on the end of this. I screw it directly into the camera.
Icing is another problem which is usually taken care of with a desicant strip, well cleaned sensor, and a camera which has been blown out with a quite hot hair dryer. Here in Mt Beauty the Rel Humidity over winter is often in the very high 90's% and with ambient temps falling to 0 or below during an imaging session it can be hard, I have used argon gas to purge the camera and while this works well, if the camera is left on the telescope overnight some leakage occurs through the USB and power sockets. I have found the best method to be to just blow the camera out with a hot hair dryer and assemble quickly just before an imaging session. It works well, take only a few seconds to do and has no ill effects on the camera.
To clean the CCD I use a lint free cloth, Isopropyl alch or acetone.
Good luck.
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