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Thermal shock to a lens potentially could cause it to crack. I have not heard of this type of cleaning ever before and it sounds extreme.
Imagine putting steam on an objective lens that was cool or cold from an air conditioned room?
It could damage the lens potentially.
Roland Christen has advised not to subject your scope to sudden changes in temperature.
Thermal shock is the issue.
Cleaning lenses is not that hard with the right approach. Nor is it damaging.
Greg.
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