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I found them to be less than effective and often leave a thin film on the mirror. Also, its possible, though highly improbable, that you may crack an optic due to the temperature differential. Though this is more likely with a lens than a mirror.
I may get pilloried for this, but I use an electric leaf blower. It shifts a huge volume of air at ambient, with enough force to shift 99% of the smuts that collect on the surface.
It also cools my 8" Newt to within a degree of the surrounding air in a about a minute.
YMMV.
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