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Peter, Well, I guess we've quite effectively hijacked Adam's thread, solly bout that!
I'd never thought of a small dew heater strap. Must buy one and try. I feel pretty confident the bag+argon takes care of the internal stuff. Just make sure you don't mislay the sealing ring for the nose section when reinstalling.
The other suggestion here re sticky stuff to catch the dust also sounds interesting.
I use acetone to clean the CCD followed by a microfibre cloth after it's dry.
PS, I'm using the QHY8Pro on the C8 front with a hyperstar for LMC stuff at the moment, so I imagine spacing there would be even more critical, although the IR external filter side is enclosed quite well. Still fogged up. Dew heater sounds the trick.
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