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Not surprisingly I've owned many SBIG cameras over the years....and have honestly had minuscule problems with CCD icing. That said I have serviced a handful of cameras that have a penchant to ice up.
The drill is to desiccate the desiccant cylinder: it goes into a high vacuum chamber and gets baked at 90 centigrade for a few hours. Those familiar with the dark art of hyper sensitizing photographic film will understand why this works *really* well.
I then flush the chamber with Argon to get it to 1 atmosphere before cracking the seal.
The camera head also gets flushed with a low pressure Argon gas fill and is quickly plugged with the revamped desiccant cylinder. Argon is a noble gas hence won't cause any nasty corrosion problems.
Hope that helps.
So far so good. Cameras that I suspect have leaky seals last around 6 months or more. Most last 2 years.
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